Normalize release artifacts before publishing

.github/workflows/ddss-publish.yml

@@ -0,0 +1,166 @@
+name: DDSS
+
+on:
+  workflow_run:
+    workflows:
+      - PLONDS
+    types:
+      - completed
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag'
+        required: true
+        type: string
+
+env:
+  DOTNET_VERSION: '10.0.x'
+
+jobs:
+  publish:
+    if: ${{ github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      actions: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Resolve release tag
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            RAW_TAG="${{ github.event.inputs.tag }}"
+            if [[ "$RAW_TAG" == v* ]]; then
+              TAG="$RAW_TAG"
+            else
+              TAG="v$RAW_TAG"
+            fi
+          else
+            gh run download "${{ github.event.workflow_run.id }}" -n plonds-run-metadata -D plonds-run-metadata
+            TAG="$(tr -d '\r\n' < plonds-run-metadata/tag.txt)"
+          fi
+
+          echo "RELEASE_TAG=${TAG}" >> "$GITHUB_ENV"
+          echo "S3_BASE_URL=${{ vars.S3_ENDPOINT }}/${{ vars.S3_BUCKET }}/lanmountain/update/releases/${TAG}/assets" >> "$GITHUB_ENV"
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: preview
+
+      - name: Prepare signing key
+        env:
+          UPDATE_PRIVATE_KEY_PEM: ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+          PLONDS_SIGNING_KEY: ${{ secrets.PLONDS_SIGNING_KEY }}
+          PDC_SIGNING_KEY: ${{ secrets.PDC_SIGNING_KEY }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          KEY="${PLONDS_SIGNING_KEY:-}"
+          if [[ -z "$KEY" ]]; then KEY="${UPDATE_PRIVATE_KEY_PEM:-}"; fi
+          if [[ -z "$KEY" ]]; then KEY="${PDC_SIGNING_KEY:-}"; fi
+          if [[ -z "$KEY" ]]; then
+            echo "No signing key is configured."
+            exit 1
+          fi
+          printf '%s' "$KEY" > update-private-key.pem
+          echo "UPDATE_PRIVATE_KEY_PATH=$PWD/update-private-key.pem" >> "$GITHUB_ENV"
+
+      - name: Build PLONDS tool
+        run: dotnet build PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj -c Release
+
+      - name: Download release assets
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p release-assets
+          gh release download "$RELEASE_TAG" -D release-assets
+          find release-assets -maxdepth 1 -type f | sort
+
+      - name: Upload release assets to Rainyun S3
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_KEY }}
+          AWS_DEFAULT_REGION: ${{ vars.S3_REGION }}
+          AWS_REGION: ${{ vars.S3_REGION }}
+          S3_ENDPOINT: ${{ vars.S3_ENDPOINT }}
+          S3_BUCKET: ${{ vars.S3_BUCKET }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          aws --version
+          for file in release-assets/*; do
+            [[ -f "$file" ]] || continue
+            name="$(basename "$file")"
+            if [[ "$name" == "ddss.json" || "$name" == "ddss.json.sig" ]]; then
+              continue
+            fi
+            key="lanmountain/update/releases/${RELEASE_TAG}/assets/${name}"
+            sha256="$(sha256sum "$file" | awk '{print $1}')"
+            existing_sha="$(aws --endpoint-url "$S3_ENDPOINT" --region "$AWS_REGION" s3api head-object --bucket "$S3_BUCKET" --key "$key" --query 'Metadata.sha256' --output text 2>/dev/null || true)"
+            if [[ "$existing_sha" == "$sha256" ]]; then
+              echo "Skip existing asset: $name"
+              continue
+            fi
+            aws --endpoint-url "$S3_ENDPOINT" --region "$AWS_REGION" s3api put-object \
+              --bucket "$S3_BUCKET" \
+              --key "$key" \
+              --body "$file" \
+              --metadata "sha256=$sha256"
+          done
+
+      - name: Build DDSS manifest
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p ddss-output
+          dotnet run --project PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj --configuration Release -- \
+            build-ddss \
+            --release-tag "$RELEASE_TAG" \
+            --assets-dir release-assets \
+            --output-dir ddss-output \
+            --private-key "$UPDATE_PRIVATE_KEY_PATH" \
+            --repository "${{ github.repository }}" \
+            --s3-base-url "$S3_BASE_URL"
+
+      - name: Upload DDSS manifest to release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          gh release upload "$RELEASE_TAG" ddss-output/ddss.json ddss-output/ddss.json.sig --clobber
+
+      - name: Upload DDSS manifest to Rainyun S3
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.S3_SECRET_KEY }}
+          AWS_DEFAULT_REGION: ${{ vars.S3_REGION }}
+          AWS_REGION: ${{ vars.S3_REGION }}
+          S3_ENDPOINT: ${{ vars.S3_ENDPOINT }}
+          S3_BUCKET: ${{ vars.S3_BUCKET }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          for file in ddss-output/ddss.json ddss-output/ddss.json.sig; do
+            name="$(basename "$file")"
+            key="lanmountain/update/releases/${RELEASE_TAG}/assets/${name}"
+            sha256="$(sha256sum "$file" | awk '{print $1}')"
+            aws --endpoint-url "$S3_ENDPOINT" --region "$AWS_REGION" s3api put-object \
+              --bucket "$S3_BUCKET" \
+              --key "$key" \
+              --body "$file" \
+              --metadata "sha256=$sha256"
+          done

.github/workflows/plonds-build.yml

@@ -0,0 +1,235 @@
+name: PLONDS
+
+on:
+  release:
+    types:
+      - published
+      - prereleased
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag'
+        required: true
+        type: string
+      baseline_tag:
+        description: 'Optional baseline tag'
+        required: false
+        type: string
+      channel:
+        description: 'Update channel'
+        required: false
+        type: choice
+        default: stable
+        options:
+          - stable
+          - preview
+
+env:
+  DOTNET_VERSION: '10.0.x'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Resolve release context
+        shell: bash
+        run: |
+          if [[ "${{ github.event_name }}" == "release" ]]; then
+            TAG="${{ github.event.release.tag_name }}"
+            if [[ "${{ github.event.release.prerelease }}" == "true" ]]; then
+              CHANNEL="preview"
+            else
+              CHANNEL="stable"
+            fi
+            BASELINE_TAG=""
+          else
+            RAW_TAG="${{ github.event.inputs.tag }}"
+            if [[ "${RAW_TAG}" == v* ]]; then
+              TAG="${RAW_TAG}"
+            else
+              TAG="v${RAW_TAG}"
+            fi
+            CHANNEL="${{ github.event.inputs.channel }}"
+            BASELINE_TAG="${{ github.event.inputs.baseline_tag }}"
+          fi
+
+          echo "RELEASE_TAG=${TAG}" >> "$GITHUB_ENV"
+          echo "RELEASE_VERSION=${TAG#v}" >> "$GITHUB_ENV"
+          echo "RELEASE_CHANNEL=${CHANNEL}" >> "$GITHUB_ENV"
+          echo "BASELINE_TAG_INPUT=${BASELINE_TAG}" >> "$GITHUB_ENV"
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+          dotnet-quality: preview
+
+      - name: Prepare signing key
+        env:
+          UPDATE_PRIVATE_KEY_PEM: ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+          PLONDS_SIGNING_KEY: ${{ secrets.PLONDS_SIGNING_KEY }}
+          PDC_SIGNING_KEY: ${{ secrets.PDC_SIGNING_KEY }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          KEY="${PLONDS_SIGNING_KEY:-}"
+          if [[ -z "$KEY" ]]; then KEY="${UPDATE_PRIVATE_KEY_PEM:-}"; fi
+          if [[ -z "$KEY" ]]; then KEY="${PDC_SIGNING_KEY:-}"; fi
+          if [[ -z "$KEY" ]]; then
+            echo "No signing key is configured."
+            exit 1
+          fi
+          printf '%s' "$KEY" > update-private-key.pem
+          echo "UPDATE_PRIVATE_KEY_PATH=$PWD/update-private-key.pem" >> "$GITHUB_ENV"
+
+      - name: Build PLONDS tool
+        run: dotnet build PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj -c Release
+
+      - name: Resolve baseline plan
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $repo = '${{ github.repository }}'
+          $tag = $env:RELEASE_TAG
+          $baselineInput = $env:BASELINE_TAG_INPUT
+          $currentRelease = gh release view $tag --repo $repo --json tagName,isPrerelease,assets,publishedAt | ConvertFrom-Json
+          $allReleases = gh api "repos/$repo/releases?per_page=100" | ConvertFrom-Json
+          $platforms = @('windows-x64', 'windows-x86', 'linux-x64')
+
+          $entries = foreach ($platform in $platforms) {
+            $assetName = "files-$platform.zip"
+            $currentAsset = $currentRelease.assets | Where-Object { $_.name -eq $assetName } | Select-Object -First 1
+            if (-not $currentAsset) {
+              throw "Current release $tag does not contain required asset $assetName"
+            }
+
+            $baselineRelease = $null
+            if (-not [string]::IsNullOrWhiteSpace($baselineInput)) {
+              $normalizedBaseline = if ($baselineInput.StartsWith('v')) { $baselineInput } else { "v$baselineInput" }
+              $baselineRelease = $allReleases | Where-Object { $_.tag_name -eq $normalizedBaseline } | Select-Object -First 1
+              if (-not $baselineRelease) {
+                throw "Specified baseline tag not found: $normalizedBaseline"
+              }
+            }
+            else {
+              $baselineRelease = $allReleases |
+                Where-Object {
+                  $_.tag_name -ne $tag -and
+                  -not $_.draft -and
+                  [bool]$_.prerelease -eq [bool]$currentRelease.isPrerelease -and
+                  ($_.assets | Where-Object { $_.name -eq $assetName } | Measure-Object).Count -gt 0
+                } |
+                Select-Object -First 1
+            }
+
+            [pscustomobject]@{
+              platform = $platform
+              assetName = $assetName
+              baselineTag = if ($baselineRelease) { $baselineRelease.tag_name } else { $null }
+              baselineVersion = if ($baselineRelease) { ($baselineRelease.tag_name -replace '^v', '') } else { $null }
+              isFullPayload = -not $baselineRelease
+            }
+          }
+
+          $plan = [pscustomobject]@{
+            tag = $tag
+            version = $env:RELEASE_VERSION
+            channel = $env:RELEASE_CHANNEL
+            platforms = $entries
+          }
+
+          $plan | ConvertTo-Json -Depth 8 | Set-Content plonds-plan.json -Encoding utf8
+          Get-Content plonds-plan.json
+
+      - name: Download payload zips
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $repo = '${{ github.repository }}'
+          $plan = Get-Content plonds-plan.json | ConvertFrom-Json
+
+          foreach ($entry in $plan.platforms) {
+            $currentDir = Join-Path $PWD "plonds-input/current/$($entry.platform)"
+            New-Item -ItemType Directory -Path $currentDir -Force | Out-Null
+            gh release download $plan.tag --repo $repo -p $entry.assetName -D $currentDir
+
+            if (-not [string]::IsNullOrWhiteSpace($entry.baselineTag)) {
+              $baselineDir = Join-Path $PWD "plonds-input/baseline/$($entry.platform)"
+              New-Item -ItemType Directory -Path $baselineDir -Force | Out-Null
+              gh release download $entry.baselineTag --repo $repo -p $entry.assetName -D $baselineDir
+            }
+          }
+
+      - name: Build delta assets
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $plan = Get-Content plonds-plan.json | ConvertFrom-Json
+          foreach ($entry in $plan.platforms) {
+            $currentZip = Join-Path $PWD "plonds-input/current/$($entry.platform)/$($entry.assetName)"
+            $args = @(
+              'run', '--project', 'PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj', '--configuration', 'Release', '--',
+              'build-delta',
+              '--platform', $entry.platform,
+              '--current-version', $plan.version,
+              '--current-tag', $plan.tag,
+              '--current-zip', $currentZip,
+              '--output-dir', 'plonds-output',
+              '--private-key', $env:UPDATE_PRIVATE_KEY_PATH,
+              '--channel', $plan.channel
+            )
+
+            if ([bool]$entry.isFullPayload) {
+              $args += @('--is-full-payload', 'true')
+            }
+            else {
+              $baselineZip = Join-Path $PWD "plonds-input/baseline/$($entry.platform)/$($entry.assetName)"
+              $args += @('--baseline-tag', $entry.baselineTag, '--baseline-version', $entry.baselineVersion, '--baseline-zip', $baselineZip)
+            }
+
+            dotnet @args
+          }
+
+          dotnet run --project PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj --configuration Release -- `
+            build-index `
+            --release-tag $plan.tag `
+            --version $plan.version `
+            --channel $plan.channel `
+            --platform-summaries-dir plonds-output/platform-summaries `
+            --output-dir plonds-output `
+            --private-key $env:UPDATE_PRIVATE_KEY_PATH
+
+      - name: Upload PLONDS assets to release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          gh release upload "$RELEASE_TAG" plonds-output/release-assets/* --clobber
+
+      - name: Persist run metadata
+        shell: bash
+        run: |
+          mkdir -p plonds-run-metadata
+          printf '%s' "$RELEASE_TAG" > plonds-run-metadata/tag.txt
+
+      - name: Upload run metadata artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: plonds-run-metadata
+          path: plonds-run-metadata/tag.txt
+          if-no-files-found: error
+          retention-days: 7

.github/workflows/release.yml

@@ -30,14 +30,22 @@ jobs:
       informational_version: ${{ steps.version.outputs.informational_version }}
       tag: ${{ steps.version.outputs.tag }}
       checkout_ref: ${{ steps.version.outputs.checkout_ref }}
+      is_prerelease: ${{ steps.version.outputs.is_prerelease }}
+      release_channel: ${{ steps.version.outputs.release_channel }}
 
     steps:
+      - name: Checkout repository metadata
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
       - name: Get release info
         id: version
         run: |
           if [[ "${{ github.event_name }}" == "push" ]]; then
             TAG="${GITHUB_REF#refs/tags/}"
             CHECKOUT_REF="${GITHUB_REF}"
+            IS_PRERELEASE="false"
           else
             RAW_TAG="${{ github.event.inputs.tag }}"
             if [[ "${RAW_TAG}" == refs/tags/* ]]; then
@@ -47,19 +55,40 @@ jobs:
             else
               TAG="v${RAW_TAG}"
             fi
-            CHECKOUT_REF="${GITHUB_SHA}"
+
+            if git rev-parse -q --verify "refs/tags/${TAG}" >/dev/null; then
+              CHECKOUT_REF="refs/tags/${TAG}"
+            else
+              CHECKOUT_REF="${GITHUB_SHA}"
+            fi
+
+            if [[ "${{ github.event.inputs.is_prerelease }}" == "true" ]]; then
+              IS_PRERELEASE="true"
+            else
+              IS_PRERELEASE="false"
+            fi
           fi
+
           VERSION="${TAG#v}"
           IFS='.' read -r -a VERSION_PARTS <<< "${VERSION}"
           while [ "${#VERSION_PARTS[@]}" -lt 4 ]; do
             VERSION_PARTS+=("0")
           done
           ASSEMBLY_VERSION="${VERSION_PARTS[0]}.${VERSION_PARTS[1]}.${VERSION_PARTS[2]}.${VERSION_PARTS[3]}"
-          echo "tag=${TAG}" >> $GITHUB_OUTPUT
+
-          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          if [[ "${IS_PRERELEASE}" == "true" ]]; then
-          echo "assembly_version=${ASSEMBLY_VERSION}" >> $GITHUB_OUTPUT
+            RELEASE_CHANNEL="preview"
-          echo "informational_version=${VERSION}" >> $GITHUB_OUTPUT
+          else
-          echo "checkout_ref=${CHECKOUT_REF}" >> $GITHUB_OUTPUT
+            RELEASE_CHANNEL="stable"
+          fi
+
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
+          echo "assembly_version=${ASSEMBLY_VERSION}" >> "$GITHUB_OUTPUT"
+          echo "informational_version=${VERSION}" >> "$GITHUB_OUTPUT"
+          echo "checkout_ref=${CHECKOUT_REF}" >> "$GITHUB_OUTPUT"
+          echo "is_prerelease=${IS_PRERELEASE}" >> "$GITHUB_OUTPUT"
+          echo "release_channel=${RELEASE_CHANNEL}" >> "$GITHUB_OUTPUT"
 
   build-windows:
     needs: prepare
@@ -107,9 +136,6 @@ jobs:
           $arch = "${{ matrix.arch }}"
           $launcherPublishDir = "publish/launcher-win-$arch"
 
-          Write-Host "Publishing Launcher with AOT for Windows $arch..."
-
-          # AOT publish
           dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj `
             -c Release `
             -o ./$launcherPublishDir `
@@ -120,27 +146,16 @@ jobs:
             -p:IncludeNativeLibrariesForSelfExtract=true `
             -p:EnableCompressionInSingleFile=true `
             -p:DebugType=none `
-            -p:DebugSymbols=false
+            -p:DebugSymbols=false `
+            -p:Version=${{ needs.prepare.outputs.version }} `
+            -p:AssemblyVersion=${{ needs.prepare.outputs.assembly_version }} `
+            -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} `
+            -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
           if ($LASTEXITCODE -ne 0) {
             Write-Error "Launcher AOT publish failed"
             exit 1
           }
-
-          # 鏄剧ず鍙戝竷缁撴灉
-          Write-Host "Launcher published to: $launcherPublishDir"
-          $exeFile = Get-ChildItem -Path $launcherPublishDir -Filter "*.exe" | Select-Object -First 1
-          if ($exeFile) {
-            $size = [Math]::Round($exeFile.Length / 1MB, 2)
-            Write-Host "Launcher executable: $($exeFile.Name) ($size MB)"
-          }
-
-          # Warn if unexpected extra files are produced
-          $files = Get-ChildItem -Path $launcherPublishDir -File
-          if ($files.Count -gt 1) {
-            Write-Host "Warning: Expected single file but found $($files.Count) files"
-            $files | ForEach-Object { Write-Host "  - $($_.Name)" }
-          }
         shell: pwsh
 
       - name: Publish Main App
@@ -178,9 +193,6 @@ jobs:
               -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} `
               -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
           }
-
-          Write-Host "Published to: $publishDir"
-          Write-Host "Self-contained: $selfContained"
         shell: pwsh
 
       - name: Restructure for Launcher
@@ -191,30 +203,18 @@ jobs:
           $publishDir = if ($selfContained) { "publish/windows-$arch" } else { "publish/windows-$arch-lite" }
           $launcherPublishDir = "publish/launcher-win-$arch"
           $appDir = "app-$version"
-
-          Write-Host "Restructuring for Launcher mode..."
-          Write-Host "Version: $version"
-          Write-Host "Publish dir: $publishDir"
-
           $newStructure = "publish-launcher/windows-$arch"
-          New-Item -ItemType Directory -Path $newStructure -Force | Out-Null
 
+          New-Item -ItemType Directory -Path $newStructure -Force | Out-Null
           $appPath = Join-Path $newStructure $appDir
           Move-Item -Path $publishDir -Destination $appPath -Force
 
-          $launcherSource = $launcherPublishDir
+          if (Test-Path $launcherPublishDir) {
-          if (Test-Path $launcherSource) {
+            Copy-Item -Path "$launcherPublishDir\*" -Destination $newStructure -Recurse -Force
-            Write-Host "Copying Launcher to root..."
-            Copy-Item -Path "$launcherSource\*" -Destination $newStructure -Recurse -Force
-          } else {
-            Write-Warning "Launcher publish dir not found: $launcherSource"
           }
 
           New-Item -ItemType File -Path (Join-Path $appPath ".current") -Force | Out-Null
 
-          Write-Host "New directory structure:"
-          Get-ChildItem -Path $newStructure -Recurse -Depth 2 | Select-Object FullName
-
           Remove-Item -Path $publishDir -Recurse -Force -ErrorAction SilentlyContinue
           Remove-Item -Path $launcherPublishDir -Recurse -Force -ErrorAction SilentlyContinue
           Move-Item -Path $newStructure -Destination $publishDir -Force
@@ -230,60 +230,31 @@ jobs:
         run: |
           $version = "${{ needs.prepare.outputs.version }}"
           $arch = "${{ matrix.arch }}"
-          $selfContained = "${{ matrix.self_contained }}" -eq "true"
           $suffix = "${{ matrix.suffix }}"
-          $publishDir = if ($selfContained) { "publish\windows-$arch" } else { "publish\windows-$arch-lite" }
+          $selfContained = "${{ matrix.self_contained }}" -eq "true"
-          $installerScript = "LanMountainDesktop\installer\LanMountainDesktop.iss"
+          $publishDir = if ($selfContained) { "publish/windows-$arch" } else { "publish/windows-$arch-lite" }
           $outputDir = "build-installer"
-
+          $installerScript = "LanMountainDesktop/installer/LanMountainDesktop.iss"
-          if (-not (Test-Path -Path $publishDir)) {
-            Write-Error "Publish directory not found: $publishDir"
-            Get-ChildItem -Path "publish" -Directory -ErrorAction SilentlyContinue | Select-Object Name
-            exit 1
-          }
 
           New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
 
-          if (-not (Test-Path -Path $installerScript)) {
-            Write-Error "Installer script not found: $installerScript"
-            exit 1
-          }
-
-          $isccPath = $null
-          $isccCommand = Get-Command ISCC.exe -ErrorAction SilentlyContinue
-          if ($isccCommand) {
-            $isccPath = $isccCommand.Source
-          }
-
           $candidatePaths = @(
-            "C:\Program Files (x86)\Inno Setup 6\ISCC.exe",
+            (Get-Command iscc.exe -ErrorAction SilentlyContinue | Select-Object -ExpandProperty Source -ErrorAction SilentlyContinue),
-            "C:\Program Files\Inno Setup 6\ISCC.exe",
+            "$env:ProgramFiles(x86)\Inno Setup 6\ISCC.exe",
-            "$env:ChocolateyInstall\bin\ISCC.exe",
+            "$env:ProgramFiles\Inno Setup 6\ISCC.exe",
             "$env:ChocolateyInstall\lib\innosetup\tools\ISCC.exe"
-          )
+          ) | Where-Object { $_ -and (Test-Path $_) }
 
+          $isccPath = $candidatePaths | Select-Object -First 1
           if (-not $isccPath) {
-            foreach ($candidate in $candidatePaths) {
-              if ($candidate -and (Test-Path -Path $candidate)) {
-                $isccPath = $candidate
-                break
-              }
-            }
-          }
-
-          if (-not $isccPath) {
-            Write-Host "ISCC.exe was not found in PATH or known locations."
-            Write-Host "Checked locations:"
-            $candidatePaths | ForEach-Object { Write-Host " - $_" }
-            Write-Host "Chocolatey bin listing (if exists):"
-            Get-ChildItem "$env:ChocolateyInstall\bin" -Filter "*iscc*" -ErrorAction SilentlyContinue | Select-Object FullName
             Write-Error "Inno Setup compiler not found."
             exit 1
           }
 
-          Write-Host "Found Inno Setup at: $isccPath"
+          if (-not (Test-Path $installerScript)) {
-
+            Write-Error "Installer script not found: $(Join-Path $PWD $installerScript)"
-          Write-Host "Building installer for Windows $arch with version $version..."
+            exit 1
+          }
 
           $publishDir = (Resolve-Path $publishDir).Path
           $outputDir = (Resolve-Path $outputDir).Path
@@ -299,8 +270,6 @@ jobs:
             $installerScript
           )
 
-          Write-Host "Compile command: `"$isccPath`" $($compileArgs -join ' ')"
-
           & $isccPath @compileArgs
           if ($LASTEXITCODE -ne 0) {
             Write-Error "Inno Setup compiler exited with code $LASTEXITCODE"
@@ -312,102 +281,53 @@ jobs:
             Write-Error "Failed to create installer"
             exit 1
           }
-
-          Write-Host "Successfully created: $($installerFile.Name)"
-          Write-Host "Installer size: $([Math]::Round($installerFile.Length / 1MB, 2)) MB"
         shell: pwsh
 
-      - name: Build Signed FileMap Update Package
+      - name: Package Payload Zip
-        if: matrix.self_contained == true
         run: |
-          $ErrorActionPreference = "Stop"
-
           $version = "${{ needs.prepare.outputs.version }}"
           $arch = "${{ matrix.arch }}"
-          $platform = "windows-$arch"
+          $payloadRoot = Join-Path (Join-Path $PWD "publish/windows-$arch") "app-$version"
-          $publishDir = "publish/windows-$arch"
+          if (-not (Test-Path $payloadRoot)) {
-          $appDir = "app-$version"
+            Write-Error "Payload root not found: $payloadRoot"
-          $currentAppPath = Join-Path $publishDir $appDir
-          $outputDir = Join-Path "delta-output" $platform
-          $generateScript = "scripts/Generate-DeltaPackage.ps1"
-          $signScript = "scripts/Sign-FileMap.ps1"
-
-          if (-not (Test-Path $currentAppPath)) {
-            Write-Error "Expected app directory not found: $currentAppPath"
             exit 1
           }
 
-          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
+          $stageDir = Join-Path $PWD "payload-stage/windows-$arch"
-          & $generateScript `
+          $releaseDir = Join-Path $PWD "release-assets"
-            -PreviousVersion "0.0.0" `
+          Remove-Item -Path $stageDir -Recurse -Force -ErrorAction SilentlyContinue
-            -CurrentVersion $version `
+          New-Item -ItemType Directory -Path $stageDir -Force | Out-Null
-            -PreviousDir $currentAppPath `
+          New-Item -ItemType Directory -Path $releaseDir -Force | Out-Null
-            -CurrentDir $currentAppPath `
-            -OutputDir $outputDir
 
-          $privateKeyPem = @'
+          Get-ChildItem -Path $payloadRoot -Recurse -File | ForEach-Object {
-          ${{ secrets.PDC_SIGNING_KEY }}
+            $relative = [System.IO.Path]::GetRelativePath($payloadRoot, $_.FullName).Replace('\', '/')
-          '@.Trim()
+            if ($relative -eq '.current' -or $relative -eq '.partial' -or $relative -eq '.destroy' -or $relative.StartsWith('.current/') -or $relative.StartsWith('.partial/') -or $relative.StartsWith('.destroy/')) {
-          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+              return
-            $privateKeyPem = @'
+            }
-          ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
+
-          '@.Trim()
+            $destination = Join-Path $stageDir ($relative -replace '/', [System.IO.Path]::DirectorySeparatorChar)
-          }
+            $destinationDir = Split-Path -Path $destination -Parent
-          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
+            if (-not [string]::IsNullOrWhiteSpace($destinationDir)) {
-            Write-Error "Missing required secret: PDC_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM"
+              New-Item -ItemType Directory -Path $destinationDir -Force | Out-Null
-            exit 1
+            }
+
+            Copy-Item -Path $_.FullName -Destination $destination -Force
           }
 
-          $privateKeyPem = $privateKeyPem -replace '\\n', "`n"
+          $payloadZip = Join-Path $releaseDir "files-windows-$arch.zip"
-          $tempDir = Join-Path $env:RUNNER_TEMP "update-signing"
+          if (Test-Path $payloadZip) {
-          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
+            Remove-Item $payloadZip -Force
-
-          $privateKeyPath = Join-Path $tempDir "private-key.pem"
-          $publicKeyPath = Join-Path $tempDir "public-key.pem"
-
-          Set-Content -Path $privateKeyPath -Value $privateKeyPem -NoNewline
-          $rsa = [System.Security.Cryptography.RSA]::Create()
-          $rsa.ImportFromPem($privateKeyPem)
-          $derivedPublicKey = $rsa.ExportRSAPublicKeyPem()
-          Set-Content -Path $publicKeyPath -Value $derivedPublicKey -NoNewline
-
-          $repoPublicKeyPath = "LanMountainDesktop.Launcher/Assets/public-key.pem"
-          $repoPublicKeyPem = Get-Content -Path $repoPublicKeyPath -Raw
-          $repoRsa = [System.Security.Cryptography.RSA]::Create()
-          $repoRsa.ImportFromPem($repoPublicKeyPem)
-          $repoSpki = [Convert]::ToBase64String($repoRsa.ExportSubjectPublicKeyInfo())
-          $derivedSpki = [Convert]::ToBase64String($rsa.ExportSubjectPublicKeyInfo())
-          if ($repoSpki -ne $derivedSpki) {
-            Write-Error "Configured signing private key does not match $repoPublicKeyPath. Keep keypair consistent before publishing."
-            exit 1
           }
-
+          Compress-Archive -Path (Join-Path $stageDir '*') -DestinationPath $payloadZip -Force
-          & $signScript `
-            -FilesJsonPath (Join-Path $outputDir "files.json") `
-            -PrivateKeyPath $privateKeyPath `
-            -OutputPath (Join-Path $outputDir "files.json.sig")
-
-          Copy-Item (Join-Path $outputDir "files.json") (Join-Path $outputDir "files-$platform.json") -Force
-          Copy-Item (Join-Path $outputDir "files.json.sig") (Join-Path $outputDir "files-$platform.json.sig") -Force
-          Copy-Item (Join-Path $outputDir "update.zip") (Join-Path $outputDir "update-$platform.zip") -Force
         shell: pwsh
 
-      - name: Upload Signed FileMap Update Package
+      - name: Upload Release Assets
-        if: matrix.self_contained == true
         uses: actions/upload-artifact@v4
         with:
-          name: release-update-windows-${{ matrix.arch }}
+          name: release-windows-${{ matrix.arch }}
           path: |
-            delta-output/windows-${{ matrix.arch }}/files-windows-${{ matrix.arch }}.json
+            release-assets/files-windows-${{ matrix.arch }}.zip
-            delta-output/windows-${{ matrix.arch }}/files-windows-${{ matrix.arch }}.json.sig
+            build-installer/*.exe
-            delta-output/windows-${{ matrix.arch }}/update-windows-${{ matrix.arch }}.zip
-          if-no-files-found: error
-          retention-days: 90
-      - name: Upload Installer
-        uses: actions/upload-artifact@v4
-        with:
-          name: release-windows-${{ matrix.arch }}${{ matrix.suffix }}
-          path: build-installer/*.exe
           if-no-files-found: error
           retention-days: 30
 
@@ -432,13 +352,10 @@ jobs:
             libx11-6 libxrandr2 libxinerama1 \
             libxi6 libxcursor1 libxext6 \
             libxrender1 libxkbcommon-x11-0 \
-            clang zlib1g-dev
+            clang zlib1g-dev zip rsync
 
-          # Ubuntu 24.04+ moved several packages to t64 names.
           sudo apt-get install -y libasound2t64 || sudo apt-get install -y libasound2
           sudo apt-get install -y libportaudio2t64 || sudo apt-get install -y libportaudio2
-
-          # Prefer modern WebKit package, fallback for older images.
           sudo apt-get install -y libwebkit2gtk-4.1-dev || sudo apt-get install -y libwebkit2gtk-4.0-dev
 
       - name: Setup .NET
@@ -460,8 +377,6 @@ jobs:
 
       - name: Publish Launcher (AOT)
         run: |
-          echo "Publishing Launcher with AOT for Linux x64..."
-          
           dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj \
             -c Release \
             -o ./publish/launcher-linux-x64 \
@@ -472,15 +387,11 @@ jobs:
             -p:IncludeNativeLibrariesForSelfExtract=true \
             -p:EnableCompressionInSingleFile=true \
             -p:DebugType=none \
-            -p:DebugSymbols=false
+            -p:DebugSymbols=false \
-          
+            -p:Version=${{ needs.prepare.outputs.version }} \
-          if [ $? -ne 0 ]; then
+            -p:AssemblyVersion=${{ needs.prepare.outputs.assembly_version }} \
-            echo "Launcher AOT publish failed"
+            -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} \
-            exit 1
+            -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
-          fi
-          
-          echo "Launcher published to: ./publish/launcher-linux-x64"
-          ls -lh ./publish/launcher-linux-x64/
 
       - name: Publish Main App
         run: |
@@ -507,25 +418,15 @@ jobs:
           appDir="app-$version"
           launcherDir="publish/launcher-linux-x64"
 
-          echo "Restructuring for Launcher mode..."
-          echo "Version: $version"
-
           mkdir -p "$publishDir"
           mv "publish/linux-x64-app" "$publishDir/$appDir"
 
           if [ -d "$launcherDir" ]; then
-            echo "Copying Launcher to root..."
             cp -r "$launcherDir"/* "$publishDir/"
             chmod +x "$publishDir/LanMountainDesktop.Launcher" 2>/dev/null || true
-          else
-            echo "Warning: Launcher publish dir not found: $launcherDir"
           fi
 
           touch "$publishDir/$appDir/.current"
-
-          echo "New directory structure:"
-          find "$publishDir" -maxdepth 2 | head -50
-
           rm -rf "$launcherDir"
 
       - name: Package as DEB
@@ -538,12 +439,6 @@ jobs:
           desktop_template="LanMountainDesktop/packaging/linux/LanMountainDesktop.desktop"
           icon_source="LanMountainDesktop/packaging/linux/lanmountaindesktop.png"
 
-          if [ ! -d "$source" ]; then
-            echo "Error: Source directory not found: $source"
-            ls -la publish/ || echo "publish directory not found"
-            exit 1
-          fi
-
           mkdir -p "build-deb/DEBIAN"
           mkdir -p "build-deb/usr/local/bin"
           mkdir -p "build-deb/usr/share/applications"
@@ -552,20 +447,6 @@ jobs:
 
           cp -r "$source"/* "build-deb/usr/local/bin/"
 
-          item_count=$(find build-deb/usr/local/bin -type f 2>/dev/null | wc -l)
-          echo "DEB package contains $item_count files"
-
-          if [ "$item_count" -eq 0 ]; then
-            echo "Error: DEB package is empty after copy"
-            exit 1
-          fi
-
-          if [ ! -f "$desktop_template" ] || [ ! -f "$icon_source" ]; then
-            echo "Error: Linux desktop resources are missing"
-            ls -la "LanMountainDesktop/packaging/linux" || true
-            exit 1
-          fi
-
           sed \
             -e "s|@@EXEC@@|/usr/local/bin/LanMountainDesktop.Launcher|g" \
             -e "s|@@ICON@@|lanmountaindesktop|g" \
@@ -589,9 +470,9 @@ jobs:
             printf '%s\n' "Package: $package_name"
             printf '%s\n' "Version: $package_version"
             printf '%s\n' "Architecture: $arch"
-            printf '%s\n' "Maintainer: LanMountain Team <dev@example.com>"
+            printf '%s\n' 'Maintainer: LanMountain Team <dev@example.com>'
-            printf '%s\n' "Description: LanMountain Desktop Application"
+            printf '%s\n' 'Description: LanMountain Desktop Application'
-            printf '%s\n' " A desktop application for LanMountain."
+            printf '%s\n' ' A desktop application for LanMountain.'
           } > "build-deb/DEBIAN/control"
 
           chmod 755 "build-deb/usr/local/bin/LanMountainDesktop.Launcher" 2>/dev/null || chmod 755 "build-deb/usr/local/bin"/*
@@ -600,110 +481,49 @@ jobs:
           chmod 644 "build-deb/usr/share/icons/hicolor/256x256/apps/lanmountaindesktop.png"
           chmod 755 "build-deb/DEBIAN/postinst"
 
-          if dpkg-deb --build "build-deb" "${package_name}_${package_version}_${arch}.deb"; then
+          dpkg-deb --build "build-deb" "${package_name}_${package_version}_${arch}.deb"
-            echo "Successfully created: ${package_name}_${package_version}_${arch}.deb"
+
-            ls -lh "${package_name}_${package_version}_${arch}.deb"
+      - name: Package Payload Zip
-          else
+        run: |
-            echo "Error: Failed to build DEB package"
+          version="${{ needs.prepare.outputs.version }}"
+          payload_root="publish/linux-x64/app-$version"
+          release_dir="$PWD/release-assets"
+          stage_dir="$PWD/payload-stage/linux-x64"
+
+          if [ ! -d "$payload_root" ]; then
+            echo "Payload root not found: $payload_root"
             exit 1
           fi
 
-      - name: Build Signed FileMap Update Package
+          rm -rf "$stage_dir"
-        shell: pwsh
+          mkdir -p "$stage_dir" "$release_dir"
-        run: |
+          rsync -a \
-          $ErrorActionPreference = "Stop"
+            --exclude '.current' \
+            --exclude '.partial' \
+            --exclude '.destroy' \
+            "$payload_root/" "$stage_dir/"
 
-          $version = "${{ needs.prepare.outputs.version }}"
+          (
-          $platform = "linux-x64"
+            cd "$stage_dir"
-          $publishDir = "publish/linux-x64"
+            zip -qr "$release_dir/files-linux-x64.zip" .
-          $appDir = "app-$version"
+          )
-          $currentAppPath = Join-Path $publishDir $appDir
-          $outputDir = Join-Path "delta-output" $platform
-          $generateScript = "scripts/Generate-DeltaPackage.ps1"
-          $signScript = "scripts/Sign-FileMap.ps1"
 
-          if (-not (Test-Path $currentAppPath)) {
+      - name: Upload Release Assets
-            Write-Error "Expected app directory not found: $currentAppPath"
-            exit 1
-          }
-
-          New-Item -ItemType Directory -Path $outputDir -Force | Out-Null
-          & $generateScript `
-            -PreviousVersion "0.0.0" `
-            -CurrentVersion $version `
-            -PreviousDir $currentAppPath `
-            -CurrentDir $currentAppPath `
-            -OutputDir $outputDir
-
-          $privateKeyPem = @'
-          ${{ secrets.PDC_SIGNING_KEY }}
-          '@.Trim()
-          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
-            $privateKeyPem = @'
-          ${{ secrets.UPDATE_PRIVATE_KEY_PEM }}
-          '@.Trim()
-          }
-          if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
-            Write-Error "Missing required secret: PDC_SIGNING_KEY or UPDATE_PRIVATE_KEY_PEM"
-            exit 1
-          }
-
-          $privateKeyPem = $privateKeyPem -replace '\\n', "`n"
-          $tempDir = Join-Path $env:RUNNER_TEMP "update-signing"
-          New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
-
-          $privateKeyPath = Join-Path $tempDir "private-key.pem"
-          $publicKeyPath = Join-Path $tempDir "public-key.pem"
-
-          Set-Content -Path $privateKeyPath -Value $privateKeyPem -NoNewline
-          $rsa = [System.Security.Cryptography.RSA]::Create()
-          $rsa.ImportFromPem($privateKeyPem)
-          $derivedPublicKey = $rsa.ExportRSAPublicKeyPem()
-          Set-Content -Path $publicKeyPath -Value $derivedPublicKey -NoNewline
-
-          $repoPublicKeyPath = "LanMountainDesktop.Launcher/Assets/public-key.pem"
-          $repoPublicKeyPem = Get-Content -Path $repoPublicKeyPath -Raw
-          $repoRsa = [System.Security.Cryptography.RSA]::Create()
-          $repoRsa.ImportFromPem($repoPublicKeyPem)
-          $repoSpki = [Convert]::ToBase64String($repoRsa.ExportSubjectPublicKeyInfo())
-          $derivedSpki = [Convert]::ToBase64String($rsa.ExportSubjectPublicKeyInfo())
-          if ($repoSpki -ne $derivedSpki) {
-            Write-Error "Configured signing private key does not match $repoPublicKeyPath. Keep keypair consistent before publishing."
-            exit 1
-          }
-
-          & $signScript `
-            -FilesJsonPath (Join-Path $outputDir "files.json") `
-            -PrivateKeyPath $privateKeyPath `
-            -OutputPath (Join-Path $outputDir "files.json.sig")
-
-          Copy-Item (Join-Path $outputDir "files.json") (Join-Path $outputDir "files-$platform.json") -Force
-          Copy-Item (Join-Path $outputDir "files.json.sig") (Join-Path $outputDir "files-$platform.json.sig") -Force
-          Copy-Item (Join-Path $outputDir "update.zip") (Join-Path $outputDir "update-$platform.zip") -Force
-
-      - name: Upload Signed FileMap Update Package
         uses: actions/upload-artifact@v4
         with:
-          name: release-update-linux-x64
+          name: release-linux-x64
           path: |
-            delta-output/linux-x64/files-linux-x64.json
+            release-assets/files-linux-x64.zip
-            delta-output/linux-x64/files-linux-x64.json.sig
+            *.deb
-            delta-output/linux-x64/update-linux-x64.zip
-          if-no-files-found: error
-          retention-days: 90
-
-      - name: Upload
-        uses: actions/upload-artifact@v4
-        with:
-          name: release-linux
-          path: "*.deb"
           if-no-files-found: error
           retention-days: 30
 
   build-macos:
     needs: prepare
     runs-on: macos-latest
+    continue-on-error: true
     strategy:
+      fail-fast: false
       matrix:
         arch: [x64, arm64]
     name: Build_macOS_${{ matrix.arch }}
@@ -738,8 +558,6 @@ jobs:
 
       - name: Publish Launcher (AOT)
         run: |
-          echo "Publishing Launcher with AOT for macOS ${{ matrix.arch }}..."
-          
           dotnet publish LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj \
             -c Release \
             -o ./publish/launcher-macos-${{ matrix.arch }} \
@@ -750,15 +568,11 @@ jobs:
             -p:IncludeNativeLibrariesForSelfExtract=true \
             -p:EnableCompressionInSingleFile=true \
             -p:DebugType=none \
-            -p:DebugSymbols=false
+            -p:DebugSymbols=false \
-          
+            -p:Version=${{ needs.prepare.outputs.version }} \
-          if [ $? -ne 0 ]; then
+            -p:AssemblyVersion=${{ needs.prepare.outputs.assembly_version }} \
-            echo "Launcher AOT publish failed"
+            -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} \
-            exit 1
+            -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
-          fi
-          
-          echo "Launcher published to: ./publish/launcher-macos-${{ matrix.arch }}"
-          ls -lh ./publish/launcher-macos-${{ matrix.arch }}/
 
       - name: Publish Main App
         run: |
@@ -778,7 +592,22 @@ jobs:
             -p:FileVersion=${{ needs.prepare.outputs.assembly_version }} \
             -p:InformationalVersion=${{ needs.prepare.outputs.informational_version }}
 
+      - name: Package Payload Zip
+        run: |
+          release_dir="$PWD/release-assets"
+          stage_dir="$PWD/payload-stage/macos-${{ matrix.arch }}"
+          payload_root="publish/macos-${{ matrix.arch }}-app"
+
+          rm -rf "$stage_dir"
+          mkdir -p "$stage_dir" "$release_dir"
+          rsync -a "$payload_root/" "$stage_dir/"
+          (
+            cd "$stage_dir"
+            zip -qr "$release_dir/files-macos-${{ matrix.arch }}.zip" .
+          )
+
       - name: Restructure and Package as DMG
+        continue-on-error: true
         run: |
           version="${{ needs.prepare.outputs.version }}"
           arch="${{ matrix.arch }}"
@@ -787,41 +616,19 @@ jobs:
           launcherDir="publish/launcher-macos-$arch"
           appSourceDir="publish/macos-$arch-app"
 
-          echo "Restructuring for Launcher mode..."
-          echo "Version: $version"
-
           mkdir -p "${app_name}.app/Contents/MacOS"
-
           appDir="app-$version"
           mkdir -p "${app_name}.app/Contents/MacOS/$appDir"
 
-          if [ -d "$appSourceDir" ]; then
+          cp -r "$appSourceDir"/* "${app_name}.app/Contents/MacOS/$appDir/"
-            cp -r "$appSourceDir"/* "${app_name}.app/Contents/MacOS/$appDir/"
-          else
-            echo "Error: Main app source directory not found: $appSourceDir"
-            exit 1
-          fi
-
           if [ -d "$launcherDir" ]; then
-            echo "Copying Launcher to root..."
             cp -r "$launcherDir"/* "${app_name}.app/Contents/MacOS/"
             chmod +x "${app_name}.app/Contents/MacOS/LanMountainDesktop.Launcher" 2>/dev/null || true
-          else
-            echo "Warning: Launcher publish dir not found: $launcherDir"
           fi
 
           touch "${app_name}.app/Contents/MacOS/$appDir/.current"
-
           mkdir -p "${app_name}.app/Contents/Resources"
 
-          item_count=$(find "${app_name}.app/Contents/MacOS" -type f | wc -l)
-          echo "App bundle contains $item_count files"
-
-          if [ "$item_count" -eq 0 ]; then
-            echo "Error: App bundle is empty after copy"
-            exit 1
-          fi
-
           {
             printf '%s\n' '<?xml version="1.0" encoding="UTF-8"?>'
             printf '%s\n' '<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">'
@@ -845,141 +652,96 @@ jobs:
 
           mkdir -p dmg-temp
           cp -r "${app_name}.app" dmg-temp/
+          hdiutil create -volname "${app_name}" -srcfolder dmg-temp -ov -format UDZO "${package_name}.dmg"
 
-          if hdiutil create -volname "${app_name}" -srcfolder dmg-temp -ov -format UDZO "${package_name}.dmg" 2>&1; then
+      - name: Upload Release Assets
-            echo "Successfully created: ${package_name}.dmg"
+        if: always()
-            ls -lh "${package_name}.dmg"
-          else
-            echo "Error: Failed to create DMG"
-            exit 1
-          fi
-
-          rm -rf dmg-temp "${app_name}.app"
-
-      - name: Upload
         uses: actions/upload-artifact@v4
         with:
           name: release-macos-${{ matrix.arch }}
-          path: "*.dmg"
+          path: |
-          if-no-files-found: error
+            release-assets/files-macos-${{ matrix.arch }}.zip
+            *.dmg
+          if-no-files-found: ignore
           retention-days: 30
 
   github-release:
-    needs: [ prepare, build-windows, build-linux, build-macos ]
+    needs: [prepare, build-windows, build-linux]
     runs-on: ubuntu-latest
     permissions:
       contents: write
 
     steps:
-      - name: Download artifacts
+      - name: Download release artifacts
         uses: actions/download-artifact@v4
         with:
-          path: artifacts
+          path: release-files
           pattern: release-*
+          merge-multiple: true
 
-      - name: List artifacts structure
+      - name: Normalize release files
         run: |
-          echo "Artifact directory structure:"
+          mkdir -p release-bundle
-          find artifacts -type f -o -type d | sort
-          echo ""
-          echo "Files found:"
-          find artifacts -type f -exec ls -lh {} \;
-          echo ""
-          echo "Full tree:"
-          tree artifacts || find artifacts -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'
 
-      - name: Flatten artifacts for release
+          mapfile -t downloaded_files < <(find release-files -type f)
+          if [ "${#downloaded_files[@]}" -eq 0 ]; then
+            echo "No downloaded release artifacts were found."
+            exit 1
+          fi
+
+          for file in "${downloaded_files[@]}"; do
+            base_name="$(basename "$file")"
+            target_path="release-bundle/$base_name"
+
+            if [ -e "$target_path" ]; then
+              echo "Duplicate release asset name detected: $base_name"
+              echo "Conflicting file: $file"
+              exit 1
+            fi
+
+            cp "$file" "$target_path"
+          done
+
+      - name: Validate release files
         run: |
-          echo "Organizing artifacts..."
+          echo "Release files:"
-          mkdir -p release-files
+          find release-bundle -maxdepth 1 -type f -exec ls -lh {} \;
-          # Copy installers and packages
+
-          find artifacts -type f \( -name "*.exe" -o -name "*.deb" -o -name "*.dmg" \) -exec cp -v {} release-files/ \;
+          if [ ! -f release-bundle/files-windows-x64.zip ] || [ ! -f release-bundle/files-windows-x86.zip ] || [ ! -f release-bundle/files-linux-x64.zip ]; then
-          # Copy signed file-map incremental update assets
+            echo "Required payload zips are missing."
-          find artifacts -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" \) -exec cp -v {} release-files/ \;
+            exit 1
-          echo ""
+          fi
-          echo "Files ready for release:"
+
-          ls -lh release-files/ || echo "No files found in release-files"
+          file_count=$(find release-bundle -maxdepth 1 -type f | wc -l)
-          echo ""
-          echo "Total files:"
-          file_count=$(find release-files -type f | wc -l)
-          echo "$file_count"
           if [ "$file_count" -eq 0 ]; then
-            echo "Error: No release files found"
+            echo "No release files were produced."
             exit 1
           fi
 
-      - name: Upload Incremental Assets to S3 (optional)
+      - name: Create or Update Release
-        if: ${{ vars.S3_ENDPOINT != '' && vars.S3_BUCKET != '' }}
-        env:
-          S3_ENDPOINT: ${{ vars.S3_ENDPOINT }}
-          S3_BUCKET: ${{ vars.S3_BUCKET }}
-          S3_REGION: ${{ vars.S3_REGION != '' && vars.S3_REGION || 'cn-nb1' }}
-          S3_ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
-          S3_SECRET_KEY: ${{ secrets.S3_SECRET_KEY }}
-          S3_OBJECT_PREFIX: lanmountain/distribution-v1
-        run: |
-          set -euo pipefail
-
-          if [ -z "${S3_ACCESS_KEY:-}" ] || [ -z "${S3_SECRET_KEY:-}" ]; then
-            echo "S3 credentials are not configured. Skipping optional S3 upload step."
-            exit 0
-          fi
-
-          python3 -m pip install --upgrade awscli
-
-          mkdir -p release-update-assets
-          find release-files -type f \( -name "files-*.json" -o -name "files-*.json.sig" -o -name "update-*.zip" \) -exec cp -v {} release-update-assets/ \;
-
-          asset_count=$(find release-update-assets -type f | wc -l)
-          if [ "$asset_count" -eq 0 ]; then
-            echo "Error: no incremental update assets found for S3 upload."
-            exit 1
-          fi
-
-          export AWS_ACCESS_KEY_ID="$S3_ACCESS_KEY"
-          export AWS_SECRET_ACCESS_KEY="$S3_SECRET_KEY"
-          export AWS_DEFAULT_REGION="$S3_REGION"
-
-          version_prefix="${S3_OBJECT_PREFIX}/${{ needs.prepare.outputs.version }}/"
-          latest_prefix="${S3_OBJECT_PREFIX}/latest/"
-
-          aws --endpoint-url "$S3_ENDPOINT" s3 sync release-update-assets "s3://${S3_BUCKET}/${version_prefix}" --only-show-errors
-          aws --endpoint-url "$S3_ENDPOINT" s3 sync release-update-assets "s3://${S3_BUCKET}/${latest_prefix}" --delete --only-show-errors
-
-      - name: Create Release
         uses: ncipollo/release-action@v1
         with:
           tag: ${{ needs.prepare.outputs.tag }}
           name: ${{ needs.prepare.outputs.tag }}
-          commit: ${{ github.sha }}
           allowUpdates: true
           draft: false
-          prerelease: ${{ github.event.inputs.is_prerelease == 'true' }}
+          prerelease: ${{ needs.prepare.outputs.is_prerelease == 'true' }}
-          artifacts: "release-files/**"
+          artifacts: 'release-bundle/*'
           body: |
             ## Release ${{ needs.prepare.outputs.version }}
 
-            ### Windows
+            ### Installers
-            - **LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x64.exe** - 64-bit installer (includes .NET runtime)
+            - `LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x64.exe`
-            - **LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x86.exe** - 32-bit installer (includes .NET runtime)
+            - `LanMountainDesktop-Setup-${{ needs.prepare.outputs.version }}-x86.exe`
+            - `LanMountainDesktop_${{ needs.prepare.outputs.version }}_amd64.deb`
 
-            **Note:** The Launcher is now built with AOT (Ahead-of-Time) compilation as a single executable file for faster startup and smaller footprint.
+            ### Payload Archives
-
+            - `files-windows-x64.zip`
-            Installation: Double-click the .exe file and follow the wizard.
+            - `files-windows-x86.zip`
-
+            - `files-linux-x64.zip`
-            ### Incremental Update Assets
-            - **files-windows-x64.json / files-windows-x64.json.sig / update-windows-x64.zip**
-            - **files-windows-x86.json / files-windows-x86.json.sig / update-windows-x86.zip**
-            - **files-linux-x64.json / files-linux-x64.json.sig / update-linux-x64.zip**
-
-            Existing users: Launcher will detect platform-matching signed assets and apply update on next startup.
-
-            ### Linux
-            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-linux-x64.deb** - Debian package (x64)
 
             ### macOS
-            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-macos-x64.dmg** - Intel processor
+            - macOS assets are best-effort and will not block the release.
-            - **LanMountainDesktop-${{ needs.prepare.outputs.version }}-macos-arm64.dmg** - Apple Silicon (M1/M2/M3)
 
-            See commits for changes.
+            Release keeps only the stable installer and payload outputs. PLONDS delta assets and external mirror metadata are generated by follow-up workflows.
           token: ${{ secrets.GITHUB_TOKEN }}

.trae/specs/pdc-incremental-migration/checklist.md

@@ -1,10 +1,13 @@
 # Checklist
 
-- [x] `release.yml` produces signed FileMap incremental assets for Windows x64/x86 and Linux x64.
+- [ ] `release.yml` includes PDCC publish flow and does not invoke Velopack.
-- [x] `release.yml` no longer depends on `vpk`/VeloPack packaging.
+- [ ] `release.yml` uploads app payload artifacts for PDCC.
-- [x] Launcher update engine applies only signed FileMap payload path.
+- [ ] S3 output path is rooted at `lanmountain/update/` (no system version prefix).
-- [x] Host update workflow no longer expects `releases.win.json`/`*.nupkg`.
+- [ ] S3 has `repo/`, `meta/`, and `installers/` outputs after a release run.
-- [x] Update source setting includes `pdc` and preserves GitHub fallback behavior.
+- [ ] Host update source default is `stcn` and old `pdc` values are auto-normalized.
+- [ ] Host can persist PDC payload into launcher incoming directory.
+- [ ] Launcher can apply PDC FileMap payload with signature/hash verification.
+- [ ] Legacy signed `files.json + update.zip` path still works as compatibility fallback.
 - [ ] CI run attached proving all release matrix jobs pass.
 - [ ] N-1 -> N incremental update verified on Windows x64/x86 and Linux x64.
 - [ ] Rollback verification report attached.

.trae/specs/pdc-incremental-migration/spec.md

@@ -2,29 +2,43 @@
 
 ## Goal
 
-Replace VeloPack-based incremental packaging with a unified signed FileMap pipeline and prepare for PDC/S3 distribution compatibility, while keeping Launcher installation, rollback, and update orchestration ownership unchanged.
+Replace VeloPack-based incremental packaging with a unified PDC FileMap + object-repo pipeline, while keeping Launcher installation, rollback, and update orchestration ownership unchanged.
 
-## Stage 1 (Completed in this round)
+## Stage 1 (Completed)
 
-- Release workflow outputs signed FileMap incremental assets as the primary path:
+- Release workflow removed VeloPack-based release packaging.
-  - `files-windows-x64.json` / `.sig` / `update-windows-x64.zip`
+- Signed FileMap path was restored as an interim release mechanism.
-  - `files-windows-x86.json` / `.sig` / `update-windows-x86.zip`
+- Host/Launcher fallback behavior stayed compatible with `files.json + files.json.sig + update.zip`.
-  - `files-linux-x64.json` / `.sig` / `update-linux-x64.zip`
-- Launcher and host update runtime remove VeloPack branches and return to signed FileMap apply path.
-- Host update asset discovery supports platform-scoped names with fallback to legacy generic names.
-- Optional S3 sync publishes incremental assets in parallel with GitHub Release assets.
 
-## Stage 2 (In Progress)
+## Stage 2 (Current Implementation Target)
 
-- Introduce PDC-compatible update source (`pdc`) with fallback to GitHub.
+- Move release publishing to PDCC + `phainon.yml` (ClassIsland-style).
-- Add PDC metadata/latest/distribution API consumption abstraction.
+- Promote PDC-distributed FileMap/object-repo as the primary incremental path.
-- Keep Launcher install/apply/rollback state machine unchanged.
+- Keep GitHub Release installers and metadata as parallel distribution.
-- Prepare `phainon.yml`-compatible release metadata for future PDCC integration.
+- Keep Launcher state machine ownership (`.current/.partial/.destroy` + snapshots).
+- Update source defaults to `stcn` (S3/PDC), with GitHub fallback.
+- S3 object root is fixed to `lanmountain/update/` with no update-system version prefix.
+
+Expected S3 layout:
+  - `lanmountain/update/repo/<hash-prefix>/<hash-object>`
+  - `lanmountain/update/meta/channels/<channel>/<subchannel>/latest.json`
+  - `lanmountain/update/meta/distributions/<distributionId>/*.json`
+  - `lanmountain/update/installers/<platform>/<arch>/*`
 
 ## Acceptance
 
-- `release.yml` no longer contains VeloPack packaging steps.
+- `release.yml` includes PDCC publish steps and no Velopack steps.
-- Windows x64/x86 and Linux x64 release jobs all upload signed FileMap incremental assets.
+- Release jobs keep building installers for Windows x64/x86, Linux x64, and macOS.
-- Host auto-update can detect and download platform-matching signed FileMap assets.
+- PDC metadata + FileMap + object repo are published under `lanmountain/update/`.
-- Launcher `update apply` succeeds with signed FileMap payload and rollback behavior remains unchanged.
+- Host can consume PDC payload (`stcn` source) and fallback to GitHub when unavailable.
-- Optional S3 upload step works when S3 secrets/vars are configured.
+- Launcher can apply both:
+  - legacy signed `files.json + update.zip`
+  - PDC FileMap object-repo payload.
+- Rollback semantics remain unchanged.
+
+## Deprecated Notes
+
+- The following interim outputs are compatibility-only (not the long-term primary path):
+  - `files-windows-x64.json` / `.sig` / `update-windows-x64.zip`
+  - `files-windows-x86.json` / `.sig` / `update-windows-x86.zip`
+  - `files-linux-x64.json` / `.sig` / `update-linux-x64.zip`

.trae/specs/pdc-incremental-migration/tasks.md

@@ -1,12 +1,15 @@
 # Tasks
 
 - [x] Remove VeloPack packaging from release workflow.
-- [x] Promote signed FileMap generation to release primary path.
+- [x] Keep signed FileMap path as interim compatibility fallback.
-- [x] Output platform-scoped incremental assets for Windows x64/x86 and Linux x64.
+- [x] Remove launcher/runtime Velopack branching.
-- [x] Remove launcher/runtime VeloPack branches.
+- [ ] Add `phainon.yml` for PDCC publish configuration.
-- [x] Update host asset discovery to platform-scoped signed FileMap naming.
+- [ ] Add PDCC installation + publish steps in `release.yml`.
-- [x] Add optional S3 sync for incremental assets.
+- [ ] Upload app payload artifacts for PDCC consumption in release build jobs.
-- [x] Extend update source values with `pdc`.
+- [ ] Publish PDC metadata + object repo to S3 path root `lanmountain/update/`.
-- [x] Add PDC check fallback service skeleton in settings domain.
+- [ ] Mirror installers to `lanmountain/update/installers/<platform>/<arch>/`.
-- [ ] Add full PDC FileMap object-hash download/deploy path.
+- [ ] Replace update source canonical value with `stcn` (keep legacy `pdc` compatibility).
-- [ ] Add PDCC publish integration and `phainon.yml` CI publishing flow.
+- [ ] Add PDC payload model into host update check result.
+- [ ] Add host download path for PDC payload (`pdc-filemap.json` + signature + metadata).
+- [ ] Add launcher PDC FileMap apply path with rollback-compatible semantics.
+- [ ] Keep old `files.json + update.zip` path behind compatibility fallback.

LanMountainDesktop.Launcher/App.axaml.cs

@@ -214,14 +214,12 @@ public partial class App : Application
             var deploymentLocator = new DeploymentLocator(appRoot);
             
             // TODO: 从配置读取 GitHub 仓库信息
-            var updateCheckService = new UpdateCheckService("ClassIsland", "LanMountainDesktop");
             
             coordinator = new LauncherFlowCoordinator(
                 context,
                 deploymentLocator,
                 new OobeStateService(appRoot),
                 new UpdateEngineService(deploymentLocator),
-                updateCheckService,
                 new PluginInstallerService());
 
             result = await coordinator.RunAsync(splashWindow).ConfigureAwait(false);

LanMountainDesktop.Launcher/AppJsonContext.cs

@@ -9,6 +9,11 @@ namespace LanMountainDesktop.Launcher;
 [JsonSourceGenerationOptions(WriteIndented = true, PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
 [JsonSerializable(typeof(SignedFileMap))]
 [JsonSerializable(typeof(UpdateFileEntry))]
+[JsonSerializable(typeof(PlondsUpdateMetadata))]
+[JsonSerializable(typeof(PlondsFileMap))]
+[JsonSerializable(typeof(PlondsComponentEntry))]
+[JsonSerializable(typeof(PlondsFileEntry))]
+[JsonSerializable(typeof(PlondsHashDescriptor))]
 [JsonSerializable(typeof(SnapshotMetadata))]
 [JsonSerializable(typeof(AppVersionInfo))]
 [JsonSerializable(typeof(StartupProgressMessage))]

LanMountainDesktop.Launcher/Models/UpdateModels.cs

@@ -53,3 +53,92 @@ internal sealed class UpdateApplyResult
 
     public string? RolledBackTo { get; init; }
 }
+
+internal sealed class PlondsUpdateMetadata
+{
+    public string? DistributionId { get; set; }
+
+    public string? Channel { get; set; }
+
+    public string? SubChannel { get; set; }
+
+    public string? FromVersion { get; set; }
+
+    public string? ToVersion { get; set; }
+
+    public string? FileMapPath { get; set; }
+
+    public string? FileMapSignaturePath { get; set; }
+
+    public Dictionary<string, string> Metadata { get; set; } = [];
+}
+
+internal sealed class PlondsFileMap
+{
+    public string? DistributionId { get; set; }
+
+    public string? FromVersion { get; set; }
+
+    public string? ToVersion { get; set; }
+
+    public string? Version { get; set; }
+
+    public string? Platform { get; set; }
+
+    public string? Arch { get; set; }
+
+    public Dictionary<string, string> Metadata { get; set; } = [];
+
+    public List<PlondsComponentEntry> Components { get; set; } = [];
+
+    public List<PlondsFileEntry> Files { get; set; } = [];
+}
+
+internal sealed class PlondsComponentEntry
+{
+    public string Name { get; set; } = string.Empty;
+
+    public string? Version { get; set; }
+
+    public Dictionary<string, string> Metadata { get; set; } = [];
+
+    public List<PlondsFileEntry> Files { get; set; } = [];
+}
+
+internal sealed class PlondsFileEntry
+{
+    public string Path { get; set; } = string.Empty;
+
+    public string? Action { get; set; } = "replace";
+
+    public string? Url { get; set; }
+
+    public string? ObjectUrl { get; set; }
+
+    public string? ObjectPath { get; set; }
+
+    public string? ObjectKey { get; set; }
+
+    public string? ArchivePath { get; set; }
+
+    public string? Sha256 { get; set; }
+
+    public string? Sha512 { get; set; }
+
+    public string? Sha512Base64 { get; set; }
+
+    public byte[]? Sha512Bytes { get; set; }
+
+    public PlondsHashDescriptor? Hash { get; set; }
+
+    public Dictionary<string, string> Metadata { get; set; } = [];
+}
+
+internal sealed class PlondsHashDescriptor
+{
+    public string? Algorithm { get; set; }
+
+    public string? Value { get; set; }
+
+    public byte[]? Bytes { get; set; }
+}

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs

@@ -22,7 +22,6 @@ internal sealed class LauncherFlowCoordinator
     private readonly DeploymentLocator _deploymentLocator;
     private readonly OobeStateService _oobeStateService;
     private readonly UpdateEngineService _updateEngine;
-    private readonly UpdateCheckService _updateCheckService;
     private readonly PluginInstallerService _pluginInstallerService;
     private readonly IReadOnlyList<IOobeStep> _oobeSteps;
 
@@ -31,14 +30,12 @@ internal sealed class LauncherFlowCoordinator
         DeploymentLocator deploymentLocator,
         OobeStateService oobeStateService,
         UpdateEngineService updateEngine,
-        UpdateCheckService updateCheckService,
         PluginInstallerService pluginInstallerService)
     {
         _context = context;
         _deploymentLocator = deploymentLocator;
         _oobeStateService = oobeStateService;
         _updateEngine = updateEngine;
-        _updateCheckService = updateCheckService;
         _pluginInstallerService = pluginInstallerService;
         _oobeSteps = [new WelcomeOobeStep(_oobeStateService)];
     }

LanMountainDesktop/App.axaml.cs

@@ -1085,6 +1085,12 @@ public partial class App : Application
         // 延迟报告 Ready 直到窗口实际打开并可见
         // 使用 Opened 事件确保所有资源已加载完毕
         mainWindow.Opened += OnMainWindowOpened;
+
+        // 手动显示窗口，因为在 ShutdownMode.OnExplicitShutdown 模式下框架不会自动调用 Show
+        if (!mainWindow.IsVisible)
+        {
+            mainWindow.Show();
+        }
         
         // 兜底机制：如果 Opened 事件 10 秒内未触发，强制发送 Ready 信号
         // 防止因渲染问题导致 Opened 不触发，启动器 Splash 窗口一直显示

LanMountainDesktop/Models/AppSettingsSnapshot.cs

@@ -85,7 +85,7 @@ public sealed class AppSettingsSnapshot
 
     public string UpdateMode { get; set; } = "download_then_confirm";
 
-    public string UpdateDownloadSource { get; set; } = "pdc";
+    public string UpdateDownloadSource { get; set; } = "stcn";
 
     public int UpdateDownloadThreads { get; set; } = 4;
 

LanMountainDesktop/Services/GitHubReleaseUpdateService.cs

@@ -34,7 +34,20 @@ public sealed record UpdateCheckResult(
     GitHubReleaseInfo? Release,
     GitHubReleaseAsset? PreferredAsset,
     string? ErrorMessage,
-    bool ForceMode = false);
+    bool ForceMode = false,
+    PlondsUpdatePayload? PlondsPayload = null);
+
+public sealed record PlondsUpdatePayload(
+    string DistributionId,
+    string ChannelId,
+    string SubChannel,
+    string? FileMapJson,
+    string? FileMapSignature,
+    string? FileMapJsonUrl,
+    string? FileMapSignatureUrl,
+    string? UpdateArchiveUrl = null,
+    string? UpdateArchiveSha256 = null,
+    long? UpdateArchiveSizeBytes = null);
 
 public sealed record UpdateDownloadResult(
     bool Success,
@@ -149,6 +162,9 @@ public sealed class GitHubReleaseUpdateService : IDisposable
             var preferredAsset = isUpdateAvailable
                 ? SelectPreferredInstallerAsset(release.Assets)
                 : null;
+            var plondsPayload = isUpdateAvailable
+                ? TryResolvePlondsPayload(release)
+                : null;
 
             return new UpdateCheckResult(
                 Success: true,
@@ -157,7 +173,8 @@ public sealed class GitHubReleaseUpdateService : IDisposable
                 LatestVersionText: latestVersionText,
                 Release: release,
                 PreferredAsset: preferredAsset,
-                ErrorMessage: null);
+                ErrorMessage: null,
+                PlondsPayload: plondsPayload);
         }
         catch (OperationCanceledException)
         {
@@ -222,6 +239,7 @@ public sealed class GitHubReleaseUpdateService : IDisposable
                 : release.TagName;
 
             var preferredAsset = SelectPreferredInstallerAsset(release.Assets);
+            var plondsPayload = TryResolvePlondsPayload(release);
 
             return new UpdateCheckResult(
                 Success: true,
@@ -231,7 +249,8 @@ public sealed class GitHubReleaseUpdateService : IDisposable
                 Release: release,
                 PreferredAsset: preferredAsset,
                 ErrorMessage: null,
-                ForceMode: true);
+                ForceMode: true,
+                PlondsPayload: plondsPayload);
         }
         catch (OperationCanceledException)
         {
@@ -642,7 +661,7 @@ public sealed class GitHubReleaseUpdateService : IDisposable
 
     private static GitHubReleaseAsset? SelectPreferredInstallerAsset(IReadOnlyList<GitHubReleaseAsset> assets)
     {
-        if (assets is null || assets.Count == 0 || !OperatingSystem.IsWindows())
+        if (assets is null || assets.Count == 0)
         {
             return null;
         }
@@ -654,12 +673,95 @@ public sealed class GitHubReleaseUpdateService : IDisposable
             _ => "x64"
         };
 
-        var ranked = assets
+        if (OperatingSystem.IsWindows())
-            .Select(asset => (Asset: asset, Score: ScoreWindowsInstallerAsset(asset.Name, architectureToken)))
+        {
-            .OrderByDescending(x => x.Score)
+            return assets
-            .ToList();
+                .Select(asset => (Asset: asset, Score: ScoreWindowsInstallerAsset(asset.Name, architectureToken)))
+                .OrderByDescending(x => x.Score)
+                .FirstOrDefault(x => x.Score > 0)
+                .Asset;
+        }
 
-        return ranked.FirstOrDefault(x => x.Score > 0).Asset;
+        if (OperatingSystem.IsLinux())
+        {
+            return assets
+                .Select(asset => (Asset: asset, Score: ScoreLinuxInstallerAsset(asset.Name, architectureToken)))
+                .OrderByDescending(x => x.Score)
+                .FirstOrDefault(x => x.Score > 0)
+                .Asset;
+        }
+
+        if (OperatingSystem.IsMacOS())
+        {
+            return assets
+                .Select(asset => (Asset: asset, Score: ScoreMacInstallerAsset(asset.Name, architectureToken)))
+                .OrderByDescending(x => x.Score)
+                .FirstOrDefault(x => x.Score > 0)
+                .Asset;
+        }
+
+        return null;
+    }
+
+    private static PlondsUpdatePayload? TryResolvePlondsPayload(GitHubReleaseInfo release)
+    {
+        if (release.Assets is null || release.Assets.Count == 0)
+        {
+            return null;
+        }
+
+        var platformSuffix = GetPlatformAssetSuffix();
+        var fileMapAsset = FindAsset(release.Assets, $"plonds-filemap-{platformSuffix}.json");
+        var signatureAsset = FindAsset(release.Assets, $"plonds-filemap-{platformSuffix}.json.sig")
+                             ?? FindAsset(release.Assets, $"plonds-filemap-{platformSuffix}.sig");
+        var archiveAsset = FindAsset(release.Assets, $"update-{platformSuffix}.zip");
+        if (fileMapAsset is null || signatureAsset is null || archiveAsset is null)
+        {
+            return null;
+        }
+
+        var distributionId = $"plonds-{release.TagName.Trim().TrimStart('v')}-{platformSuffix}";
+        var channelId = release.IsPrerelease
+            ? UpdateSettingsValues.ChannelPreview
+            : UpdateSettingsValues.ChannelStable;
+
+        return new PlondsUpdatePayload(
+            DistributionId: distributionId,
+            ChannelId: channelId,
+            SubChannel: platformSuffix,
+            FileMapJson: null,
+            FileMapSignature: null,
+            FileMapJsonUrl: fileMapAsset.BrowserDownloadUrl,
+            FileMapSignatureUrl: signatureAsset.BrowserDownloadUrl,
+            UpdateArchiveUrl: archiveAsset.BrowserDownloadUrl,
+            UpdateArchiveSha256: archiveAsset.Sha256,
+            UpdateArchiveSizeBytes: archiveAsset.SizeBytes > 0 ? archiveAsset.SizeBytes : null);
+    }
+
+    private static GitHubReleaseAsset? FindAsset(IReadOnlyList<GitHubReleaseAsset> assets, string assetName)
+    {
+        return assets.FirstOrDefault(asset => string.Equals(asset.Name, assetName, StringComparison.OrdinalIgnoreCase));
+    }
+
+    private static string GetPlatformAssetSuffix()
+    {
+        var os = OperatingSystem.IsWindows()
+            ? "windows"
+            : OperatingSystem.IsLinux()
+                ? "linux"
+                : OperatingSystem.IsMacOS()
+                    ? "macos"
+                    : "unknown";
+
+        var arch = RuntimeInformation.OSArchitecture switch
+        {
+            Architecture.X86 => "x86",
+            Architecture.Arm => "arm",
+            Architecture.Arm64 => "arm64",
+            _ => "x64"
+        };
+
+        return $"{os}-{arch}";
     }
 
     private static int ScoreWindowsInstallerAsset(string assetName, string architectureToken)
@@ -709,6 +811,94 @@ public sealed class GitHubReleaseUpdateService : IDisposable
         return score;
     }
 
+    private static int ScoreLinuxInstallerAsset(string assetName, string architectureToken)
+    {
+        if (string.IsNullOrWhiteSpace(assetName))
+        {
+            return 0;
+        }
+
+        var score = 0;
+
+        if (assetName.EndsWith(".deb", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 220;
+        }
+        else if (assetName.EndsWith(".rpm", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 180;
+        }
+        else if (assetName.EndsWith(".AppImage", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 160;
+        }
+        else
+        {
+            return 0;
+        }
+
+        if (assetName.Contains("linux", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 40;
+        }
+
+        if (assetName.Contains(architectureToken, StringComparison.OrdinalIgnoreCase) ||
+            (architectureToken == "x64" && assetName.Contains("amd64", StringComparison.OrdinalIgnoreCase)))
+        {
+            score += 40;
+        }
+        else if (assetName.Contains("x64", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("amd64", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("x86", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 30;
+        }
+
+        return score;
+    }
+
+    private static int ScoreMacInstallerAsset(string assetName, string architectureToken)
+    {
+        if (string.IsNullOrWhiteSpace(assetName))
+        {
+            return 0;
+        }
+
+        var score = 0;
+
+        if (assetName.EndsWith(".dmg", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 220;
+        }
+        else if (assetName.EndsWith(".pkg", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 180;
+        }
+        else
+        {
+            return 0;
+        }
+
+        if (assetName.Contains("mac", StringComparison.OrdinalIgnoreCase) ||
+            assetName.Contains("osx", StringComparison.OrdinalIgnoreCase))
+        {
+            score += 40;
+        }
+
+        if (assetName.Contains(architectureToken, StringComparison.OrdinalIgnoreCase))
+        {
+            score += 40;
+        }
+        else if (assetName.Contains("x64", StringComparison.OrdinalIgnoreCase) ||
+                 assetName.Contains("arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            score -= 30;
+        }
+
+        return score;
+    }
+
     private static bool TryParseVersion(string? value, out Version? version)
     {
         version = null;

LanMountainDesktop/Services/PdcReleaseUpdateService.cs

@@ -1,464 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Net.Http;
-using System.Runtime.InteropServices;
-using System.Text.Json;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace LanMountainDesktop.Services;
-
-/// <summary>
-/// Best-effort PDC client that maps PDC responses to the existing update result model.
-/// This keeps launcher update contracts stable while allowing a gradual migration.
-/// </summary>
-public sealed class PdcReleaseUpdateService : IDisposable
-{
-    private readonly HttpClient _httpClient;
-    private readonly bool _ownsHttpClient;
-
-    public PdcReleaseUpdateService(HttpClient? httpClient = null)
-    {
-        if (httpClient is null)
-        {
-            _httpClient = new HttpClient
-            {
-                Timeout = TimeSpan.FromSeconds(20)
-            };
-            _ownsHttpClient = true;
-        }
-        else
-        {
-            _httpClient = httpClient;
-            _ownsHttpClient = false;
-        }
-    }
-
-    public void Dispose()
-    {
-        if (_ownsHttpClient)
-        {
-            _httpClient.Dispose();
-        }
-    }
-
-    public Task<UpdateCheckResult> CheckForUpdatesAsync(
-        Version currentVersion,
-        bool includePrerelease,
-        CancellationToken cancellationToken = default)
-    {
-        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: false, cancellationToken);
-    }
-
-    public Task<UpdateCheckResult> ForceCheckForUpdatesAsync(
-        Version currentVersion,
-        bool includePrerelease,
-        CancellationToken cancellationToken = default)
-    {
-        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
-    }
-
-    private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
-        Version currentVersion,
-        bool includePrerelease,
-        bool isForce,
-        CancellationToken cancellationToken)
-    {
-        var normalizedCurrentVersion = NormalizeVersion(currentVersion);
-        var normalizedCurrentVersionText = FormatVersionText(normalizedCurrentVersion);
-        var endpoint = ResolveEndpoint();
-
-        if (string.IsNullOrWhiteSpace(endpoint))
-        {
-            return new UpdateCheckResult(
-                Success: false,
-                IsUpdateAvailable: false,
-                CurrentVersionText: normalizedCurrentVersionText,
-                LatestVersionText: "-",
-                Release: null,
-                PreferredAsset: null,
-                ErrorMessage: "PDC endpoint is not configured.",
-                ForceMode: isForce);
-        }
-
-        try
-        {
-            var metadataUrl = BuildUri(endpoint, "api/v1/public/distributions/metadata");
-            var metadata = await GetContentNodeAsync(metadataUrl, cancellationToken).ConfigureAwait(false);
-
-            var channelId = ResolveChannelId(metadata, includePrerelease);
-            if (string.IsNullOrWhiteSpace(channelId))
-            {
-                channelId = includePrerelease ? "preview" : "stable";
-            }
-
-            var latestUrl = BuildUri(
-                endpoint,
-                $"api/v1/public/distributions/latest/{Uri.EscapeDataString(channelId)}?appVersion={Uri.EscapeDataString(normalizedCurrentVersionText)}");
-            var latestNode = await GetContentNodeAsync(latestUrl, cancellationToken).ConfigureAwait(false);
-
-            var latestVersionText = ReadString(latestNode, "version") ?? "-";
-            if (!TryParseVersion(latestVersionText, out var latestVersion) || latestVersion is null)
-            {
-                return new UpdateCheckResult(
-                    Success: false,
-                    IsUpdateAvailable: false,
-                    CurrentVersionText: normalizedCurrentVersionText,
-                    LatestVersionText: latestVersionText,
-                    Release: null,
-                    PreferredAsset: null,
-                    ErrorMessage: "PDC latest distribution version is invalid.",
-                    ForceMode: isForce);
-            }
-
-            var distributionId = ReadString(latestNode, "distributionId");
-            if (string.IsNullOrWhiteSpace(distributionId))
-            {
-                return new UpdateCheckResult(
-                    Success: false,
-                    IsUpdateAvailable: false,
-                    CurrentVersionText: normalizedCurrentVersionText,
-                    LatestVersionText: latestVersionText,
-                    Release: null,
-                    PreferredAsset: null,
-                    ErrorMessage: "PDC latest distribution id is missing.",
-                    ForceMode: isForce);
-            }
-
-            var hasUpdate = latestVersion > normalizedCurrentVersion;
-            if (!isForce && !hasUpdate)
-            {
-                return new UpdateCheckResult(
-                    Success: true,
-                    IsUpdateAvailable: false,
-                    CurrentVersionText: normalizedCurrentVersionText,
-                    LatestVersionText: latestVersionText,
-                    Release: null,
-                    PreferredAsset: null,
-                    ErrorMessage: null,
-                    ForceMode: false);
-            }
-
-            var subChannel = ResolveSubChannel();
-            var distributionUrl = BuildUri(
-                endpoint,
-                $"api/v1/public/distributions/{Uri.EscapeDataString(distributionId)}/{Uri.EscapeDataString(subChannel)}");
-            var distributionNode = await GetContentNodeAsync(distributionUrl, cancellationToken).ConfigureAwait(false);
-
-            var assets = ResolveAssets(distributionNode);
-            if (assets.Count == 0)
-            {
-                return new UpdateCheckResult(
-                    Success: false,
-                    IsUpdateAvailable: false,
-                    CurrentVersionText: normalizedCurrentVersionText,
-                    LatestVersionText: latestVersionText,
-                    Release: null,
-                    PreferredAsset: null,
-                    ErrorMessage: "PDC distribution response does not expose downloadable update assets.",
-                    ForceMode: isForce);
-            }
-
-            var release = new GitHubReleaseInfo(
-                TagName: $"v{latestVersionText}",
-                Name: $"PDC Distribution {latestVersionText}",
-                IsPrerelease: includePrerelease,
-                IsDraft: false,
-                PublishedAt: DateTimeOffset.UtcNow,
-                Assets: assets);
-
-            return new UpdateCheckResult(
-                Success: true,
-                IsUpdateAvailable: true,
-                CurrentVersionText: normalizedCurrentVersionText,
-                LatestVersionText: latestVersionText,
-                Release: release,
-                PreferredAsset: null,
-                ErrorMessage: null,
-                ForceMode: isForce);
-        }
-        catch (OperationCanceledException)
-        {
-            throw;
-        }
-        catch (Exception ex)
-        {
-            return new UpdateCheckResult(
-                Success: false,
-                IsUpdateAvailable: false,
-                CurrentVersionText: normalizedCurrentVersionText,
-                LatestVersionText: "-",
-                Release: null,
-                PreferredAsset: null,
-                ErrorMessage: $"PDC request failed: {ex.Message}",
-                ForceMode: isForce);
-        }
-    }
-
-    private async Task<JsonElement> GetContentNodeAsync(string url, CancellationToken cancellationToken)
-    {
-        using var request = new HttpRequestMessage(HttpMethod.Get, url);
-        var token = ResolveToken();
-        if (!string.IsNullOrWhiteSpace(token))
-        {
-            request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
-        }
-
-        using var response = await _httpClient.SendAsync(request, cancellationToken).ConfigureAwait(false);
-        var body = await response.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(false);
-        if (!response.IsSuccessStatusCode)
-        {
-            throw new InvalidOperationException($"HTTP {(int)response.StatusCode}: {Truncate(body, 180)}");
-        }
-
-        using var document = JsonDocument.Parse(body);
-        var root = document.RootElement;
-        if (root.ValueKind == JsonValueKind.Object &&
-            root.TryGetProperty("content", out var content))
-        {
-            return content.Clone();
-        }
-
-        return root.Clone();
-    }
-
-    private static IReadOnlyList<GitHubReleaseAsset> ResolveAssets(JsonElement distributionNode)
-    {
-        var assets = new List<GitHubReleaseAsset>();
-        if (distributionNode.ValueKind != JsonValueKind.Object)
-        {
-            return assets;
-        }
-
-        if (distributionNode.TryGetProperty("assets", out var assetsNode) &&
-            assetsNode.ValueKind == JsonValueKind.Array)
-        {
-            foreach (var assetNode in assetsNode.EnumerateArray())
-            {
-                if (assetNode.ValueKind != JsonValueKind.Object)
-                {
-                    continue;
-                }
-
-                var name = ReadString(assetNode, "name");
-                var url = ReadString(assetNode, "url") ??
-                          ReadString(assetNode, "downloadUrl") ??
-                          ReadString(assetNode, "browserDownloadUrl");
-                if (string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(url))
-                {
-                    continue;
-                }
-
-                var size = ReadInt64(assetNode, "size") ?? 0L;
-                var sha256 = ReadString(assetNode, "sha256");
-                assets.Add(new GitHubReleaseAsset(name, url, size, sha256));
-            }
-        }
-
-        if (assets.Count > 0)
-        {
-            return assets;
-        }
-
-        // Field-level fallback for service-side URL projection.
-        var manifestUrl = ReadString(distributionNode, "manifestUrl")
-                          ?? ReadString(distributionNode, "fileMapUrl");
-        var signatureUrl = ReadString(distributionNode, "signatureUrl")
-                           ?? ReadString(distributionNode, "fileMapSignatureUrl");
-        var archiveUrl = ReadString(distributionNode, "archiveUrl")
-                         ?? ReadString(distributionNode, "updateArchiveUrl")
-                         ?? ReadString(distributionNode, "payloadUrl");
-
-        if (!string.IsNullOrWhiteSpace(manifestUrl))
-        {
-            assets.Add(new GitHubReleaseAsset("files.json", manifestUrl, 0, null));
-        }
-
-        if (!string.IsNullOrWhiteSpace(signatureUrl))
-        {
-            assets.Add(new GitHubReleaseAsset("files.json.sig", signatureUrl, 0, null));
-        }
-
-        if (!string.IsNullOrWhiteSpace(archiveUrl))
-        {
-            assets.Add(new GitHubReleaseAsset("update.zip", archiveUrl, 0, null));
-        }
-
-        return assets;
-    }
-
-    private static string ResolveChannelId(JsonElement metadataNode, bool includePrerelease)
-    {
-        if (metadataNode.ValueKind != JsonValueKind.Object ||
-            !metadataNode.TryGetProperty("channels", out var channelsNode))
-        {
-            return includePrerelease ? "preview" : "stable";
-        }
-
-        var defaultChannelId = ReadString(metadataNode, "defaultChannelId") ?? string.Empty;
-        if (channelsNode.ValueKind != JsonValueKind.Object)
-        {
-            return defaultChannelId;
-        }
-
-        string? matchedPreview = null;
-        string? matchedStable = null;
-
-        foreach (var channel in channelsNode.EnumerateObject())
-        {
-            var name = ReadString(channel.Value, "name") ?? channel.Name;
-            if (string.IsNullOrWhiteSpace(matchedPreview) &&
-                (name.Contains("preview", StringComparison.OrdinalIgnoreCase) ||
-                 name.Contains("beta", StringComparison.OrdinalIgnoreCase) ||
-                 name.Contains("dev", StringComparison.OrdinalIgnoreCase)))
-            {
-                matchedPreview = channel.Name;
-            }
-
-            if (string.IsNullOrWhiteSpace(matchedStable) &&
-                (name.Contains("stable", StringComparison.OrdinalIgnoreCase) ||
-                 name.Contains("release", StringComparison.OrdinalIgnoreCase)))
-            {
-                matchedStable = channel.Name;
-            }
-        }
-
-        if (includePrerelease)
-        {
-            return matchedPreview ?? defaultChannelId ?? "preview";
-        }
-
-        return matchedStable ?? defaultChannelId ?? "stable";
-    }
-
-    private static string ResolveSubChannel()
-    {
-        var configured = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_SUBCHANNEL")
-                         ?? Environment.GetEnvironmentVariable("PDC_SUBCHANNEL");
-        if (!string.IsNullOrWhiteSpace(configured))
-        {
-            return configured.Trim();
-        }
-
-        var os = OperatingSystem.IsWindows()
-            ? "windows"
-            : OperatingSystem.IsLinux()
-                ? "linux"
-                : OperatingSystem.IsMacOS()
-                    ? "macos"
-                    : "unknown";
-
-        var arch = RuntimeInformation.OSArchitecture switch
-        {
-            Architecture.X86 => "x86",
-            Architecture.Arm => "arm",
-            Architecture.Arm64 => "arm64",
-            _ => "x64"
-        };
-
-        return $"{os}_{arch}_release_folderClassic";
-    }
-
-    private static string? ResolveEndpoint()
-    {
-        var endpoint = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_ENDPOINT")
-                      ?? Environment.GetEnvironmentVariable("PDC_ENDPOINT");
-        return string.IsNullOrWhiteSpace(endpoint) ? null : endpoint.Trim().TrimEnd('/');
-    }
-
-    private static string? ResolveToken()
-    {
-        var token = Environment.GetEnvironmentVariable("LANMOUNTAIN_PDC_TOKEN")
-                    ?? Environment.GetEnvironmentVariable("PDC_TOKEN");
-        return string.IsNullOrWhiteSpace(token) ? null : token.Trim();
-    }
-
-    private static string BuildUri(string endpoint, string relativePath)
-    {
-        return $"{endpoint.TrimEnd('/')}/{relativePath.TrimStart('/')}";
-    }
-
-    private static string? ReadString(JsonElement node, string propertyName)
-    {
-        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
-        {
-            return null;
-        }
-
-        return value.ValueKind == JsonValueKind.String
-            ? value.GetString()
-            : value.ToString();
-    }
-
-    private static long? ReadInt64(JsonElement node, string propertyName)
-    {
-        if (node.ValueKind != JsonValueKind.Object || !node.TryGetProperty(propertyName, out var value))
-        {
-            return null;
-        }
-
-        if (value.TryGetInt64(out var number))
-        {
-            return number;
-        }
-
-        var text = value.ToString();
-        return long.TryParse(text, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsed)
-            ? parsed
-            : null;
-    }
-
-    private static bool TryParseVersion(string? value, out Version? version)
-    {
-        version = null;
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            return false;
-        }
-
-        var normalized = value.Trim().TrimStart('v', 'V');
-        var separatorIndex = normalized.IndexOfAny(['-', '+', ' ']);
-        if (separatorIndex > 0)
-        {
-            normalized = normalized[..separatorIndex];
-        }
-
-        if (!Version.TryParse(normalized, out var parsed))
-        {
-            return false;
-        }
-
-        version = NormalizeVersion(parsed);
-        return true;
-    }
-
-    private static Version NormalizeVersion(Version version)
-    {
-        var major = Math.Max(0, version.Major);
-        var minor = Math.Max(0, version.Minor);
-        var build = Math.Max(0, version.Build >= 0 ? version.Build : 0);
-        var revision = Math.Max(0, version.Revision >= 0 ? version.Revision : 0);
-        return revision > 0
-            ? new Version(major, minor, build, revision)
-            : new Version(major, minor, build);
-    }
-
-    private static string FormatVersionText(Version version)
-    {
-        return version.Revision > 0
-            ? version.ToString(4)
-            : version.ToString(3);
-    }
-
-    private static string Truncate(string value, int maxLength)
-    {
-        if (string.IsNullOrEmpty(value) || value.Length <= maxLength)
-        {
-            return value;
-        }
-
-        return value[..maxLength];
-    }
-}

LanMountainDesktop/Services/PlondsReleaseUpdateService.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace LanMountainDesktop.Services;
+
+/// <summary>
+/// Release-backed PLONDS checker.
+/// It only succeeds when the latest GitHub Release already exposes platform PLONDS assets.
+/// If those assets are not ready yet, callers can fall back to the normal GitHub installer flow.
+/// </summary>
+public sealed class PlondsReleaseUpdateService : IDisposable
+{
+    private readonly GitHubReleaseUpdateService _githubReleaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
+
+    public Task<UpdateCheckResult> CheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: false, cancellationToken);
+    }
+
+    public Task<UpdateCheckResult> ForceCheckForUpdatesAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        CancellationToken cancellationToken = default)
+    {
+        return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
+    }
+
+    public void Dispose()
+    {
+        _githubReleaseUpdateService.Dispose();
+    }
+
+    private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        bool isForce,
+        CancellationToken cancellationToken)
+    {
+        var releaseResult = isForce
+            ? await _githubReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+            : await _githubReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+
+        if (!releaseResult.Success)
+        {
+            return releaseResult;
+        }
+
+        if (!isForce && !releaseResult.IsUpdateAvailable)
+        {
+            return releaseResult with { ForceMode = false };
+        }
+
+        if (releaseResult.PlondsPayload is not null)
+        {
+            return releaseResult with { ForceMode = isForce };
+        }
+
+        var latestVersion = string.IsNullOrWhiteSpace(releaseResult.LatestVersionText)
+            ? "-"
+            : releaseResult.LatestVersionText;
+        var message = releaseResult.Release is null
+            ? "GitHub Release data is unavailable for PLONDS."
+            : $"Release {latestVersion} does not expose platform PLONDS assets yet.";
+
+        return new UpdateCheckResult(
+            Success: false,
+            IsUpdateAvailable: releaseResult.IsUpdateAvailable,
+            CurrentVersionText: releaseResult.CurrentVersionText,
+            LatestVersionText: latestVersion,
+            Release: releaseResult.Release,
+            PreferredAsset: releaseResult.PreferredAsset,
+            ErrorMessage: message,
+            ForceMode: isForce,
+            PlondsPayload: null);
+    }
+}

LanMountainDesktop/Services/Settings/SettingsContracts.cs

@@ -356,6 +356,7 @@ public interface IUpdateSettingsService
     void Save(UpdateSettingsState state);
     Task<UpdateCheckResult> CheckForUpdatesAsync(Version currentVersion, bool includePrerelease, CancellationToken cancellationToken = default);
     Task<UpdateCheckResult> ForceCheckForUpdatesAsync(Version currentVersion, bool includePrerelease, CancellationToken cancellationToken = default);
+    Task<PlondsUpdatePayload?> GetPlondsUpdatePayloadAsync(Version currentVersion, bool includePrerelease, bool isForce = false, CancellationToken cancellationToken = default);
     Task<UpdateDownloadResult> DownloadAssetAsync(
         GitHubReleaseAsset asset,
         string destinationFilePath,

LanMountainDesktop/Services/Settings/SettingsDomainServices.cs

@@ -752,7 +752,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
 {
     private readonly ISettingsService _settingsService;
     private readonly GitHubReleaseUpdateService _githubReleaseUpdateService = new("wwiinnddyy", "LanMountainDesktop");
-    private readonly PdcReleaseUpdateService _pdcReleaseUpdateService = new();
+    private readonly PlondsReleaseUpdateService _plondsReleaseUpdateService = new();
 
     public UpdateSettingsService(ISettingsService settingsService)
     {
@@ -842,6 +842,18 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         return CheckForUpdatesCoreAsync(currentVersion, includePrerelease, isForce: true, cancellationToken);
     }
 
+    public async Task<PlondsUpdatePayload?> GetPlondsUpdatePayloadAsync(
+        Version currentVersion,
+        bool includePrerelease,
+        bool isForce = false,
+        CancellationToken cancellationToken = default)
+    {
+        var result = isForce
+            ? await _plondsReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+            : await _plondsReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+        return result.Success ? result.PlondsPayload : null;
+    }
+
     public Task<UpdateDownloadResult> DownloadAssetAsync(
         GitHubReleaseAsset asset,
         string destinationFilePath,
@@ -879,7 +891,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
     public void Dispose()
     {
         _githubReleaseUpdateService.Dispose();
-        _pdcReleaseUpdateService.Dispose();
+        _plondsReleaseUpdateService.Dispose();
     }
 
     private async Task<UpdateCheckResult> CheckForUpdatesCoreAsync(
@@ -889,20 +901,39 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         CancellationToken cancellationToken)
     {
         var source = UpdateSettingsValues.NormalizeDownloadSource(_settingsService.Load().UpdateDownloadSource);
-        if (string.Equals(source, UpdateSettingsValues.DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(source, UpdateSettingsValues.DownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
         {
-            var pdcResult = isForce
+            var plondsResult = isForce
-                ? await _pdcReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+                ? await _plondsReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
-                : await _pdcReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+                : await _plondsReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
 
-            if (pdcResult.Success)
+            if (plondsResult.Success)
             {
-                return pdcResult;
+                return plondsResult;
             }
 
             AppLogger.Warn(
                 "UpdateSettings",
-                $"PDC update check failed and will fallback to GitHub. Error: {pdcResult.ErrorMessage}");
+                $"PLONDS update check failed and will fallback to GitHub. Error: {plondsResult.ErrorMessage}");
+
+            var githubFallbackResult = isForce
+                ? await _githubReleaseUpdateService.ForceCheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken)
+                : await _githubReleaseUpdateService.CheckForUpdatesAsync(currentVersion, includePrerelease, cancellationToken);
+
+            if (githubFallbackResult.Success)
+            {
+                AppLogger.Info(
+                    "UpdateSettings",
+                    $"GitHub fallback succeeded after PLONDS failure. Original PLONDS error: {plondsResult.ErrorMessage}");
+            }
+            else
+            {
+                AppLogger.Warn(
+                    "UpdateSettings",
+                    $"GitHub fallback also failed after PLONDS failure. PLONDS error: {plondsResult.ErrorMessage}; GitHub error: {githubFallbackResult.ErrorMessage}");
+            }
+
+            return githubFallbackResult;
         }
 
         return isForce
@@ -1259,14 +1290,14 @@ internal sealed class ApplicationInfoService : IApplicationInfoService
 
     public string GetAppVersionText()
     {
-        // 优先从环境变量读取（Launcher 传递）
+        // 浼樺厛浠庣幆澧冨彉閲忚鍙栵紙Launcher 浼犻€掞級
         var envVersion = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.VersionEnvVar);
         if (!string.IsNullOrWhiteSpace(envVersion))
         {
             return envVersion;
         }
 
-        // 回退：从程序集读取
+        // Fallback: read from application assembly.
         var assembly = typeof(App).Assembly;
         var informationalVersion = assembly
             .GetCustomAttribute<AssemblyInformationalVersionAttribute>()?
@@ -1306,14 +1337,14 @@ internal sealed class ApplicationInfoService : IApplicationInfoService
 
     public string GetAppCodenameText()
     {
-        // 优先从环境变量读取（Launcher 传递）
+        // 浼樺厛浠庣幆澧冨彉閲忚鍙栵紙Launcher 浼犻€掞級
         var envCodename = Environment.GetEnvironmentVariable(LanMountainDesktop.Shared.Contracts.Launcher.LauncherIpcConstants.CodenameEnvVar);
         if (!string.IsNullOrWhiteSpace(envCodename))
         {
             return envCodename;
         }
 
-        // 回退：使用默认开发代号
+        // Fallback: use default codename.
         return DefaultCodename;
     }
 

LanMountainDesktop/Services/UpdateSettingsValues.cs

@@ -11,7 +11,12 @@ public static class UpdateSettingsValues
     public const string ModeDownloadThenConfirm = "download_then_confirm";
     public const string ModeSilentOnExit = "silent_on_exit";
 
-    public const string DownloadSourcePdc = "pdc";
+    // NOTE: keep constant name for compatibility with existing call sites.
+    public const string DownloadSourcePlonds = "stcn";
+    public const string DownloadSourcePdc = DownloadSourcePlonds;
+    public const string DownloadSourceStcn = DownloadSourcePlonds;
+    public const string LegacyDownloadSourcePlonds = "pdc";
+    public const string LegacyDownloadSourcePdc = LegacyDownloadSourcePlonds;
     public const string DownloadSourceGitHub = "github";
     public const string DownloadSourceGhProxy = "gh-proxy";
 
@@ -52,9 +57,14 @@ public static class UpdateSettingsValues
 
     public static string NormalizeDownloadSource(string? value)
     {
-        if (string.Equals(value, DownloadSourcePdc, StringComparison.OrdinalIgnoreCase))
+        if (string.Equals(value, LegacyDownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
         {
-            return DownloadSourcePdc;
+            return DownloadSourceStcn;
+        }
+
+        if (string.Equals(value, DownloadSourcePlonds, StringComparison.OrdinalIgnoreCase))
+        {
+            return DownloadSourcePlonds;
         }
 
         if (string.Equals(value, DownloadSourceGhProxy, StringComparison.OrdinalIgnoreCase))
@@ -67,8 +77,8 @@ public static class UpdateSettingsValues
             return DownloadSourceGitHub;
         }
 
-        // Default to PDC. Runtime will fallback to GitHub if PDC is unavailable.
+        // Default to STCN(PLONDS/S3). Runtime will fallback to GitHub if STCN is unavailable.
-        return DownloadSourcePdc;
+        return DownloadSourceStcn;
     }
 
     public static int NormalizeDownloadThreads(int value)

LanMountainDesktop/ViewModels/SettingsViewModels.cs

@@ -1965,7 +1965,7 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
                 return;
             }
 
-            if (result.PreferredAsset is null)
+            if (result.PreferredAsset is null && !UpdateWorkflowService.IsDeltaUpdateAvailable(result))
             {
                 UpdateStatus = isForce
                     ? L("settings.update.status_force_no_asset", "Release found but no compatible installer available.")
@@ -2050,7 +2050,10 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
     [RelayCommand(CanExecute = nameof(CanRedownloadUpdate))]
     private async Task RedownloadUpdateAsync()
     {
-        if (_lastCheckResult is null || !_lastCheckResult.Success || !_lastCheckResult.IsUpdateAvailable || _lastCheckResult.PreferredAsset is null)
+        if (_lastCheckResult is null ||
+            !_lastCheckResult.Success ||
+            !_lastCheckResult.IsUpdateAvailable ||
+            (_lastCheckResult.PreferredAsset is null && !UpdateWorkflowService.IsDeltaUpdateAvailable(_lastCheckResult)))
         {
             UpdateStatus = L("settings.update.status_redownload_no_check", "Please check for updates first before redownloading.");
             return;
@@ -2233,11 +2236,11 @@ public sealed partial class UpdateSettingsPageViewModel : ViewModelBase
             UpdateDownloadResult downloadResult;
 
             // Prefer delta update if available (smaller download, faster)
-            if (result.Release is not null && UpdateWorkflowService.IsDeltaUpdateAvailable(result.Release))
+            if (UpdateWorkflowService.IsDeltaUpdateAvailable(result))
             {
                 UpdateStatus = L("settings.update.status_downloading_delta", "Downloading incremental update...");
                 downloadResult = await _updateWorkflowService.DownloadDeltaUpdateAsync(result, progress);
-                if (!downloadResult.Success)
+                if (!downloadResult.Success && result.PlondsPayload is null)
                 {
                     // Delta download failed, fall back to full installer
                     AppLogger.Warn("UpdateSettings", $"Delta update download failed: {downloadResult.ErrorMessage}. Falling back to full installer.");

PenguinLogisticsOnlineNetworkDistributionSystem/Directory.Build.props

@@ -0,0 +1,14 @@
+<Project>
+  <PropertyGroup>
+    <Version>0.1.0</Version>
+    <VersionPrefix>0.1.0</VersionPrefix>
+    <PackageVersion>0.1.0</PackageVersion>
+    <AssemblyVersion>0.1.0.0</AssemblyVersion>
+    <FileVersion>0.1.0.0</FileVersion>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/README.md

@@ -0,0 +1,93 @@
+# PLONDS 骨架
+
+Penguin Logistics Online Network Distribution System（企鹅物流在线网络分发系统），简称 PLONDS，是 LanMountainDesktop 的独立更新分发骨架。
+
+本目录有意与主应用和启动器隔离，仅包含新的分发协议、一个轻量级的只读 API，以及示例 S3 风格的元数据文件。
+
+## 目录结构
+
+```text
+PenguinLogisticsOnlineNetworkDistributionSystem/
+  README.md
+  src/
+    Plonds.Shared/
+    Plonds.Api/
+  sample-data/
+    meta/
+      channels/
+        stable/
+          windows-x64/
+          windows-x86/
+          linux-x64/
+      distributions/
+```
+
+## 项目说明
+
+- `Plonds.Shared` 提供协议常量和数据模型。
+- `Plonds.Core` 负责哈希计算、差异生成、对象仓库生成、清单生成、签名和发布编排。
+- `Plonds.Tool` 是面向 CI 的命令行入口。PowerShell 脚本应保持为围绕此工具的薄包装层。
+- `Plonds.Api` 是一个轻量级只读 API，从类似 S3 布局的本地文件夹中读取元数据。
+
+## 架构设计
+
+PLONDS 有意围绕单一的 C# 实现栈构建，以确保协议和发布行为不会在不同语言之间产生偏差。
+
+```text
+宿主应用
+  -> 检查更新、下载对象、暂存传入的负载
+启动器
+  -> 验证签名、应用文件映射、切换部署、回滚
+
+PLONDS.Api
+  -> 面向客户端的只读元数据投影
+PLONDS.Tool
+  -> CI/发布命令界面
+PLONDS.Core
+  -> 哈希/差异/对象仓库/签名/发布实现
+PLONDS.Shared
+  -> 协议常量和 DTO
+```
+
+## v1 规则
+
+- 核心协议行为应位于 `Plonds.Core` 中，而非 PowerShell 脚本。
+- `scripts/*.ps1` 仅可作为 GitHub Actions 和本地便利的薄包装层保留。
+- 宿主应用保留下载职责。
+- 启动器保留应用、原子切换、快照和回滚职责。
+
+## 存储布局
+
+第一版本保持固定的对象根目录：
+
+```text
+lanmountain/update/
+  repo/sha256/<前缀>/<哈希>
+  meta/channels/<频道>/<平台>/latest.json
+  meta/distributions/<分发ID>.json
+  installers/<平台>/<版本>/...
+```
+
+已规划但 v1 中未启用：
+
+```text
+lanmountain/update/repo-compressed/<算法>/<前缀>/<哈希>
+lanmountain/update/patches/<算法>/<基础哈希>/<目标哈希>
+```
+
+## 公共接口
+
+API 基础路径为 `/api/plonds/v1`。
+
+- `GET /healthz` - 健康检查
+- `GET /api/plonds/v1/metadata` - 获取元数据目录
+- `GET /api/plonds/v1/channels/{channel}/{platform}/latest?currentVersion=...` - 获取指定频道和平台的最新版本
+- `GET /api/plonds/v1/distributions/{distributionId}` - 获取指定分发版本的完整信息
+
+## 本地运行
+
+```powershell
+dotnet run --project src/Plonds.Api
+```
+
+默认情况下，API 从 `sample-data` 读取元数据。

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/linux-x64/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "linux-x64",
+  "distributionId": "plonds-0.8.5.2-linux-x64",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-linux-x64.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-linux-x64.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/windows-x64/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "windows-x64",
+  "distributionId": "plonds-0.8.5.2-windows-x64",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-windows-x64.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-windows-x64.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/channels/stable/windows-x86/latest.json

@@ -0,0 +1,10 @@
+{
+  "channel": "stable",
+  "platform": "windows-x86",
+  "distributionId": "plonds-0.8.5.2-windows-x86",
+  "version": "0.8.5.2",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "distributionPath": "meta/distributions/plonds-0.8.5.2-windows-x86.json",
+  "fileMapPath": "meta/distributions/plonds-0.8.5.2-windows-x86.json"
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-linux-x64.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-linux-x64",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "linux-x64",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-linux",
+          "size": 2048000,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-linux"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/linux-x64/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-0.8.5.2-linux-x64.deb",
+          "op": "add",
+          "contentHash": "sha256-placeholder-linux-x64-installer",
+          "size": 3096576,
+          "mode": "file-object",
+          "objectKey": "installers/linux-x64/LanMountainDesktop-0.8.5.2-linux-x64.deb"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "linux",
+      "arch": "x64",
+      "url": "https://downloads.example.invalid/lanmountain/linux-x64/LanMountainDesktop-0.8.5.2-linux-x64.deb",
+      "fileName": "LanMountainDesktop-0.8.5.2-linux-x64.deb"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-windows-x64.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-windows-x64",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "windows-x64",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop.exe",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-exe",
+          "size": 1024000,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-exe"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/windows-x64/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-Setup-0.8.5.2-x64.exe",
+          "op": "add",
+          "contentHash": "sha256-placeholder-windows-x64-installer",
+          "size": 2048000,
+          "mode": "file-object",
+          "objectKey": "installers/windows-x64/LanMountainDesktop-Setup-0.8.5.2-x64.exe"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "windows",
+      "arch": "x64",
+      "url": "https://downloads.example.invalid/lanmountain/windows-x64/LanMountainDesktop-Setup-0.8.5.2-x64.exe",
+      "fileName": "LanMountainDesktop-Setup-0.8.5.2-x64.exe"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/sample-data/meta/distributions/plonds-0.8.5.2-windows-x86.json

@@ -0,0 +1,66 @@
+{
+  "distributionId": "plonds-0.8.5.2-windows-x86",
+  "version": "0.8.5.2",
+  "channel": "stable",
+  "platform": "windows-x86",
+  "publishedAt": "2026-04-20T00:00:00Z",
+  "components": [
+    {
+      "id": "app",
+      "root": "app-0.8.5.2/",
+      "mode": "file-object",
+      "metadata": {
+        "allowDiffUpdate": "true"
+      },
+      "files": [
+        {
+          "path": "LanMountainDesktop.exe",
+          "op": "replace",
+          "contentHash": "sha256-placeholder-lanmountain-exe-x86",
+          "size": 983040,
+          "mode": "file-object",
+          "objectKey": "repo/sha256/sha256-placeholder-lanmountain-exe-x86"
+        }
+      ]
+    },
+    {
+      "id": "installers",
+      "root": "installers/windows-x86/",
+      "mode": "file-object",
+      "files": [
+        {
+          "path": "LanMountainDesktop-Setup-0.8.5.2-x86.exe",
+          "op": "add",
+          "contentHash": "sha256-placeholder-windows-x86-installer",
+          "size": 1982464,
+          "mode": "file-object",
+          "objectKey": "installers/windows-x86/LanMountainDesktop-Setup-0.8.5.2-x86.exe"
+        }
+      ]
+    }
+  ],
+  "installerMirrors": [
+    {
+      "platform": "windows",
+      "arch": "x86",
+      "url": "https://downloads.example.invalid/lanmountain/windows-x86/LanMountainDesktop-Setup-0.8.5.2-x86.exe",
+      "fileName": "LanMountainDesktop-Setup-0.8.5.2-x86.exe"
+    }
+  ],
+  "capabilities": [
+    "file-object",
+    "compressed-object",
+    "binary-patch"
+  ],
+  "signatures": [
+    {
+      "algorithm": "rsa-sha256",
+      "keyId": "lanmountain-main",
+      "signature": "placeholder-signature"
+    }
+  ],
+  "metadata": {
+    "notes": "sample distribution for PLONDS skeleton"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Configuration/PlondsApiOptions.cs

@@ -0,0 +1,11 @@
+namespace Plonds.Api.Configuration;
+
+public sealed class PlondsApiOptions
+{
+    public string StorageRoot { get; set; } = Plonds.Shared.PlondsConstants.DefaultStorageRoot;
+
+    public string MetaRoot { get; set; } = Plonds.Shared.PlondsConstants.DefaultMetaRoot;
+
+    public string ApiBasePath { get; set; } = Plonds.Shared.PlondsConstants.DefaultApiBasePath;
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Plonds.Api.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <RootNamespace>Plonds.Api</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Program.cs

@@ -0,0 +1,86 @@
+using Microsoft.Extensions.Options;
+using Plonds.Api.Configuration;
+using Plonds.Api.Services;
+using Plonds.Shared;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.Configure<PlondsApiOptions>(builder.Configuration.GetSection("Plonds"));
+builder.Services.AddSingleton(sp =>
+{
+    var options = sp.GetRequiredService<IOptions<PlondsApiOptions>>().Value;
+    return options;
+});
+builder.Services.AddSingleton<IPlondsManifestStore>(sp =>
+{
+    var options = sp.GetRequiredService<PlondsApiOptions>();
+    return new FileSystemPlondsManifestStore(options);
+});
+
+var app = builder.Build();
+
+var apiBasePath = app.Configuration["Plonds:ApiBasePath"];
+if (string.IsNullOrWhiteSpace(apiBasePath))
+{
+    apiBasePath = PlondsConstants.DefaultApiBasePath;
+}
+
+if (!apiBasePath.StartsWith('/'))
+{
+    apiBasePath = "/" + apiBasePath;
+}
+
+app.MapGet("/healthz", () => Results.Ok(new { status = "ok", protocol = PlondsConstants.ProtocolName, version = PlondsConstants.ProtocolVersion }));
+
+app.MapGet($"{apiBasePath}/metadata", async (IPlondsManifestStore store, CancellationToken cancellationToken) =>
+{
+    var catalog = await store.GetCatalogAsync(cancellationToken);
+    return Results.Ok(catalog);
+});
+
+app.MapGet($"{apiBasePath}/channels/{{channel}}/{{platform}}/latest", async (
+    string channel,
+    string platform,
+    string? currentVersion,
+    IPlondsManifestStore store,
+    CancellationToken cancellationToken) =>
+{
+    var latest = await store.GetLatestAsync(channel, platform, cancellationToken);
+    if (latest is null)
+    {
+        return Results.NotFound(new
+        {
+            error = "latest_pointer_not_found",
+            channel,
+            platform
+        });
+    }
+
+    if (!string.IsNullOrWhiteSpace(currentVersion) &&
+        Version.TryParse(currentVersion, out var current) &&
+        Version.TryParse(latest.Version, out var target) &&
+        target <= current)
+    {
+        return Results.NoContent();
+    }
+
+    return Results.Ok(latest);
+});
+
+app.MapGet($"{apiBasePath}/distributions/{{distributionId}}", async (string distributionId, IPlondsManifestStore store, CancellationToken cancellationToken) =>
+{
+    var distribution = await store.GetDistributionAsync(distributionId, cancellationToken);
+    if (distribution is null)
+    {
+        return Results.NotFound(new
+        {
+            error = "distribution_not_found",
+            distributionId
+        });
+    }
+
+    return Results.Ok(distribution);
+});
+
+app.Run();
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Services/FileSystemPlondsManifestStore.cs

@@ -0,0 +1,138 @@
+using System.Text.Json;
+using Plonds.Api.Configuration;
+using Plonds.Shared;
+using Plonds.Shared.Models;
+
+namespace Plonds.Api.Services;
+
+public sealed class FileSystemPlondsManifestStore : IPlondsManifestStore
+{
+    private static readonly JsonSerializerOptions JsonOptions = new(JsonSerializerDefaults.Web)
+    {
+        WriteIndented = true
+    };
+
+    private readonly PlondsApiOptions _options;
+    private readonly string _storageRootFullPath;
+    private readonly string _metaRootFullPath;
+
+    public FileSystemPlondsManifestStore(PlondsApiOptions options)
+    {
+        _options = options;
+        _storageRootFullPath = ResolveRootPath(options.StorageRoot);
+        _metaRootFullPath = Path.Combine(_storageRootFullPath, options.MetaRoot);
+    }
+
+    public Task<PlondsMetadataCatalog> GetCatalogAsync(CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+
+        var channelsRoot = Path.Combine(_metaRootFullPath, "channels");
+        var latest = new List<PlondsChannelPointer>();
+        if (Directory.Exists(channelsRoot))
+        {
+            foreach (var latestPath in Directory.EnumerateFiles(channelsRoot, "latest.json", SearchOption.AllDirectories))
+            {
+                var pointer = ReadLatestPointer(latestPath);
+                if (pointer is not null)
+                {
+                    latest.Add(pointer);
+                }
+            }
+        }
+
+        var catalog = new PlondsMetadataCatalog(
+            ProtocolName: PlondsConstants.ProtocolName,
+            ProtocolVersion: PlondsConstants.ProtocolVersion,
+            StorageRoot: _storageRootFullPath,
+            MetaRoot: _metaRootFullPath,
+            Latest: latest.OrderBy(x => x.Channel, StringComparer.OrdinalIgnoreCase)
+                .ThenBy(x => x.Platform, StringComparer.OrdinalIgnoreCase)
+                .ToArray(),
+            Metadata: new Dictionary<string, string>
+            {
+                ["apiBasePath"] = PlondsConstants.DefaultApiBasePath
+            });
+
+        return Task.FromResult(catalog);
+    }
+
+    public Task<PlondsChannelPointer?> GetLatestAsync(string channel, string platform, CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+        return Task.FromResult(ReadLatestPointer(GetLatestPath(channel, platform)));
+    }
+
+    public Task<PlondsDistributionInfo?> GetDistributionAsync(string distributionId, CancellationToken cancellationToken = default)
+    {
+        _ = cancellationToken;
+
+        var path = GetDistributionPath(distributionId);
+        if (!File.Exists(path))
+        {
+            return Task.FromResult<PlondsDistributionInfo?>(null);
+        }
+
+        var json = File.ReadAllText(path);
+        var distribution = JsonSerializer.Deserialize<PlondsDistributionInfo>(json, JsonOptions);
+        return Task.FromResult(distribution);
+    }
+
+    private PlondsChannelPointer? ReadLatestPointer(string path)
+    {
+        if (!File.Exists(path))
+        {
+            return null;
+        }
+
+        var json = File.ReadAllText(path);
+        var pointer = JsonSerializer.Deserialize<PlondsChannelPointer>(json, JsonOptions);
+        return pointer;
+    }
+
+    private string GetLatestPath(string channel, string platform)
+    {
+        return Path.Combine(_metaRootFullPath, "channels", channel, platform, "latest.json");
+    }
+
+    private string GetDistributionPath(string distributionId)
+    {
+        return Path.Combine(_metaRootFullPath, "distributions", $"{distributionId}.json");
+    }
+
+    private static string ResolveRootPath(string root)
+    {
+        if (Path.IsPathRooted(root))
+        {
+            return Path.GetFullPath(root);
+        }
+
+        var candidates = new List<string>();
+
+        AddCandidateChain(candidates, Directory.GetCurrentDirectory(), root);
+        AddCandidateChain(candidates, AppContext.BaseDirectory, root);
+
+        foreach (var candidate in candidates.Distinct(StringComparer.OrdinalIgnoreCase))
+        {
+            if (Directory.Exists(candidate))
+            {
+                return candidate;
+            }
+        }
+
+        return candidates.FirstOrDefault() ?? Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, root));
+    }
+
+    private static void AddCandidateChain(ICollection<string> candidates, string? startDirectory, string relativeRoot)
+    {
+        var current = string.IsNullOrWhiteSpace(startDirectory)
+            ? null
+            : Path.GetFullPath(startDirectory);
+
+        while (!string.IsNullOrWhiteSpace(current))
+        {
+            candidates.Add(Path.GetFullPath(Path.Combine(current, relativeRoot)));
+            current = Directory.GetParent(current)?.FullName;
+        }
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/Services/IPlondsManifestStore.cs

@@ -0,0 +1,13 @@
+using Plonds.Shared.Models;
+
+namespace Plonds.Api.Services;
+
+public interface IPlondsManifestStore
+{
+    Task<PlondsMetadataCatalog> GetCatalogAsync(CancellationToken cancellationToken = default);
+
+    Task<PlondsChannelPointer?> GetLatestAsync(string channel, string platform, CancellationToken cancellationToken = default);
+
+    Task<PlondsDistributionInfo?> GetDistributionAsync(string distributionId, CancellationToken cancellationToken = default);
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Api/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "Plonds": {
+    "StorageRoot": "sample-data",
+    "MetaRoot": "meta",
+    "ApiBasePath": "/api/plonds/v1"
+  }
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Plonds.Core.csproj

@@ -0,0 +1,5 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/DdssBuildOptions.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record DdssBuildOptions(
+    string ReleaseTag,
+    string AssetsDirectory,
+    string OutputRoot,
+    string PrivateKeyPath,
+    string Repository,
+    string? S3BaseUrl = null);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/DdssManifestBuilder.cs

@@ -0,0 +1,68 @@
+using Plonds.Core.Security;
+using Plonds.Shared.Models;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class DdssManifestBuilder
+{
+    private readonly RsaFileSigner _signer = new();
+
+    public string Build(DdssBuildOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var assetsDirectory = Path.GetFullPath(options.AssetsDirectory);
+        if (!Directory.Exists(assetsDirectory))
+        {
+            throw new DirectoryNotFoundException($"DDSS assets directory not found: {assetsDirectory}");
+        }
+
+        var assetEntries = Directory
+            .EnumerateFiles(assetsDirectory, "*", SearchOption.TopDirectoryOnly)
+            .Where(static path =>
+            {
+                var name = Path.GetFileName(path);
+                return !name.Equals("ddss.json", StringComparison.OrdinalIgnoreCase)
+                       && !name.Equals("ddss.json.sig", StringComparison.OrdinalIgnoreCase);
+            })
+            .OrderBy(static path => Path.GetFileName(path), StringComparer.OrdinalIgnoreCase)
+            .Select(path => BuildAssetEntry(path, options.Repository, options.ReleaseTag, options.S3BaseUrl))
+            .ToArray();
+
+        var manifest = new DdssManifest(
+            FormatVersion: "1.0",
+            ReleaseTag: options.ReleaseTag,
+            GeneratedAt: DateTimeOffset.UtcNow,
+            Assets: assetEntries);
+
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        Directory.CreateDirectory(outputRoot);
+        var manifestPath = Path.Combine(outputRoot, "ddss.json");
+        PayloadUtilities.WriteJson(manifestPath, manifest);
+        _signer.SignFile(manifestPath, options.PrivateKeyPath, manifestPath + ".sig");
+        return manifestPath;
+    }
+
+    private static DdssAssetEntry BuildAssetEntry(string assetPath, string repository, string releaseTag, string? s3BaseUrl)
+    {
+        var fileName = Path.GetFileName(assetPath);
+        var mirrors = new List<DdssMirrorEntry>
+        {
+            new("github", $"https://github.com/{repository}/releases/download/{releaseTag}/{Uri.EscapeDataString(fileName)}")
+        };
+
+        if (!string.IsNullOrWhiteSpace(s3BaseUrl))
+        {
+            mirrors.Add(new DdssMirrorEntry(
+                "s3",
+                $"{s3BaseUrl.TrimEnd('/')}/{Uri.EscapeDataString(fileName)}"));
+        }
+
+        return new DdssAssetEntry(
+            AssetId: fileName,
+            FileName: fileName,
+            Sha256: PayloadUtilities.ComputeSha256(assetPath),
+            Size: new FileInfo(assetPath).Length,
+            Mirrors: mirrors);
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PayloadUtilities.cs

@@ -0,0 +1,235 @@
+using System.IO.Compression;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace Plonds.Core.Publishing;
+
+public static class PayloadUtilities
+{
+    public static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        WriteIndented = true
+    };
+
+    public static void CreatePayloadZip(string sourceDirectory, string outputZipPath)
+    {
+        var resolvedSourceDirectory = Path.GetFullPath(sourceDirectory);
+        if (!Directory.Exists(resolvedSourceDirectory))
+        {
+            throw new DirectoryNotFoundException($"Payload source directory not found: {resolvedSourceDirectory}");
+        }
+
+        var resolvedOutputZipPath = Path.GetFullPath(outputZipPath);
+        var outputDirectory = Path.GetDirectoryName(resolvedOutputZipPath);
+        if (!string.IsNullOrWhiteSpace(outputDirectory))
+        {
+            Directory.CreateDirectory(outputDirectory);
+        }
+
+        if (File.Exists(resolvedOutputZipPath))
+        {
+            File.Delete(resolvedOutputZipPath);
+        }
+
+        using var archive = ZipFile.Open(resolvedOutputZipPath, ZipArchiveMode.Create);
+        foreach (var filePath in Directory.EnumerateFiles(resolvedSourceDirectory, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = NormalizeRelativePath(Path.GetRelativePath(resolvedSourceDirectory, filePath));
+            if (ShouldIgnore(relativePath))
+            {
+                continue;
+            }
+
+            archive.CreateEntryFromFile(filePath, relativePath, CompressionLevel.Optimal);
+        }
+    }
+
+    internal static void ExtractZip(string zipPath, string destinationDirectory)
+    {
+        var resolvedZipPath = Path.GetFullPath(zipPath);
+        if (!File.Exists(resolvedZipPath))
+        {
+            throw new FileNotFoundException("Payload archive not found.", resolvedZipPath);
+        }
+
+        EnsureCleanDirectory(destinationDirectory);
+        ZipFile.ExtractToDirectory(resolvedZipPath, destinationDirectory, overwriteFiles: true);
+    }
+
+    internal static Dictionary<string, FileFingerprint> ScanDirectory(string? root)
+    {
+        var manifest = new Dictionary<string, FileFingerprint>(StringComparer.OrdinalIgnoreCase);
+        if (string.IsNullOrWhiteSpace(root) || !Directory.Exists(root))
+        {
+            return manifest;
+        }
+
+        var resolvedRoot = Path.GetFullPath(root);
+        foreach (var filePath in Directory.EnumerateFiles(resolvedRoot, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = NormalizeRelativePath(Path.GetRelativePath(resolvedRoot, filePath));
+            if (ShouldIgnore(relativePath))
+            {
+                continue;
+            }
+
+            var fileInfo = new FileInfo(filePath);
+            manifest[relativePath] = new FileFingerprint(
+                relativePath,
+                filePath,
+                ComputeSha256(filePath),
+                fileInfo.Length,
+                ResolveUnixFileMode(filePath));
+        }
+
+        return manifest;
+    }
+
+    internal static string CopyObject(string sourcePath, string objectsRoot, string sha256)
+    {
+        var normalizedSha256 = sha256.Trim().ToLowerInvariant();
+        var prefix = normalizedSha256[..Math.Min(2, normalizedSha256.Length)];
+        var relativePath = NormalizeRelativePath(Path.Combine(prefix, normalizedSha256));
+        var destinationPath = Path.Combine(objectsRoot, prefix, normalizedSha256);
+        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+        if (!File.Exists(destinationPath))
+        {
+            File.Copy(sourcePath, destinationPath, overwrite: true);
+        }
+
+        return relativePath;
+    }
+
+    internal static void EnsureCleanDirectory(string path)
+    {
+        var resolvedPath = Path.GetFullPath(path);
+        if (Directory.Exists(resolvedPath))
+        {
+            Directory.Delete(resolvedPath, recursive: true);
+        }
+
+        Directory.CreateDirectory(resolvedPath);
+    }
+
+    internal static string ComputeSha256(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        return Convert.ToHexString(SHA256.HashData(stream)).ToLowerInvariant();
+    }
+
+    internal static void WriteJson<T>(string path, T value)
+    {
+        var directory = Path.GetDirectoryName(Path.GetFullPath(path));
+        if (!string.IsNullOrWhiteSpace(directory))
+        {
+            Directory.CreateDirectory(directory);
+        }
+
+        var json = JsonSerializer.Serialize(value, JsonOptions);
+        File.WriteAllText(path, json, new UTF8Encoding(false));
+    }
+
+    internal static string NormalizeRelativePath(string value)
+    {
+        return value.Replace('\\', '/').TrimStart('/');
+    }
+
+    internal static string ResolveArch(string platform)
+    {
+        if (platform.EndsWith("-x86", StringComparison.OrdinalIgnoreCase))
+        {
+            return "x86";
+        }
+
+        if (platform.EndsWith("-arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            return "arm64";
+        }
+
+        return "x64";
+    }
+
+    internal static bool ShouldIgnore(string relativePath)
+    {
+        var normalized = NormalizeRelativePath(relativePath.Trim());
+        if (string.IsNullOrWhiteSpace(normalized))
+        {
+            return true;
+        }
+
+        return normalized.Equals(".current", StringComparison.OrdinalIgnoreCase)
+               || normalized.Equals(".partial", StringComparison.OrdinalIgnoreCase)
+               || normalized.Equals(".destroy", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith(".current/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith(".partial/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith(".destroy/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith("logs/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith("cache/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith("snapshots/", StringComparison.OrdinalIgnoreCase)
+               || normalized.StartsWith("snapshot/", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static string? ResolveUnixFileMode(string path)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return null;
+        }
+
+        try
+        {
+            var mode = File.GetUnixFileMode(path);
+            return Convert.ToString((int)mode, 8);
+        }
+        catch
+        {
+            return InferUnixFileMode(path);
+        }
+    }
+
+    private static string? InferUnixFileMode(string path)
+    {
+        if (!LooksExecutable(path))
+        {
+            return null;
+        }
+
+        return "755";
+    }
+
+    private static bool LooksExecutable(string path)
+    {
+        try
+        {
+            using var stream = File.OpenRead(path);
+            Span<byte> header = stackalloc byte[4];
+            var read = stream.Read(header);
+            if (read >= 4 &&
+                header[0] == 0x7F &&
+                header[1] == (byte)'E' &&
+                header[2] == (byte)'L' &&
+                header[3] == (byte)'F')
+            {
+                return true;
+            }
+
+            if (read >= 2 && header[0] == (byte)'#' && header[1] == (byte)'!')
+            {
+                return true;
+            }
+        }
+        catch
+        {
+            return false;
+        }
+
+        var extension = Path.GetExtension(path);
+        return string.IsNullOrWhiteSpace(extension) &&
+               !OperatingSystem.IsWindows() &&
+               Path.GetFileName(path).Contains("LanMountainDesktop", StringComparison.OrdinalIgnoreCase);
+    }
+
+    internal sealed record FileFingerprint(string RelativePath, string FullPath, string Sha256, long Size, string? UnixFileMode);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlatformPublishResult.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlatformPublishResult(
+    string Platform,
+    string DistributionId,
+    string CurrentAppDirectory,
+    string? PreviousDirectory,
+    string PreviousVersion,
+    string FileMapPath,
+    string SignaturePath,
+    string DistributionPath,
+    string LatestPath,
+    IReadOnlyList<string> InstallerFiles);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsDeltaBuildOptions.cs

@@ -0,0 +1,14 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsDeltaBuildOptions(
+    string Platform,
+    string CurrentVersion,
+    string CurrentTag,
+    string CurrentPayloadZip,
+    string OutputRoot,
+    string PrivateKeyPath,
+    string Channel = "stable",
+    string? BaselineVersion = null,
+    string? BaselineTag = null,
+    string? BaselinePayloadZip = null,
+    bool IsFullPayload = false);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsDeltaBuildResult.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsDeltaBuildResult(
+    string Platform,
+    string DistributionId,
+    string UpdateArchivePath,
+    string FileMapPath,
+    string FileMapSignaturePath,
+    string SummaryPath,
+    bool IsFullPayload,
+    string? BaselineTag,
+    string? BaselineVersion,
+    string TargetVersion);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsDeltaBuilder.cs

@@ -0,0 +1,228 @@
+using Plonds.Core.Security;
+using Plonds.Shared.Models;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsDeltaBuilder
+{
+    private readonly RsaFileSigner _signer = new();
+
+    public PlondsDeltaBuildResult Build(PlondsDeltaBuildOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var currentPayloadZip = Path.GetFullPath(options.CurrentPayloadZip);
+        if (!File.Exists(currentPayloadZip))
+        {
+            throw new FileNotFoundException("Current payload zip not found.", currentPayloadZip);
+        }
+
+        var baselinePayloadZip = string.IsNullOrWhiteSpace(options.BaselinePayloadZip)
+            ? null
+            : Path.GetFullPath(options.BaselinePayloadZip);
+        if (!string.IsNullOrWhiteSpace(baselinePayloadZip) && !File.Exists(baselinePayloadZip))
+        {
+            throw new FileNotFoundException("Baseline payload zip not found.", baselinePayloadZip);
+        }
+
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var workRoot = Path.Combine(outputRoot, "work", options.Platform);
+        var currentExtractRoot = Path.Combine(workRoot, "current");
+        var baselineExtractRoot = Path.Combine(workRoot, "baseline");
+        var objectsRoot = Path.Combine(workRoot, "objects");
+        var releaseAssetsRoot = Path.Combine(outputRoot, "release-assets");
+        var summaryRoot = Path.Combine(outputRoot, "platform-summaries");
+
+        Directory.CreateDirectory(releaseAssetsRoot);
+        Directory.CreateDirectory(summaryRoot);
+        PayloadUtilities.ExtractZip(currentPayloadZip, currentExtractRoot);
+
+        var useFullPayload = options.IsFullPayload || string.IsNullOrWhiteSpace(baselinePayloadZip);
+        if (useFullPayload)
+        {
+            PayloadUtilities.EnsureCleanDirectory(baselineExtractRoot);
+        }
+        else
+        {
+            PayloadUtilities.ExtractZip(baselinePayloadZip!, baselineExtractRoot);
+        }
+
+        PayloadUtilities.EnsureCleanDirectory(objectsRoot);
+
+        var previousManifest = useFullPayload
+            ? new Dictionary<string, PayloadUtilities.FileFingerprint>(StringComparer.OrdinalIgnoreCase)
+            : PayloadUtilities.ScanDirectory(baselineExtractRoot);
+        var currentManifest = PayloadUtilities.ScanDirectory(currentExtractRoot);
+        var fileEntries = BuildFileEntries(previousManifest, currentManifest, objectsRoot);
+
+        var updateAssetName = $"update-{options.Platform}.zip";
+        var fileMapAssetName = $"plonds-filemap-{options.Platform}.json";
+        var fileMapSignatureAssetName = fileMapAssetName + ".sig";
+        var distributionId = $"plonds-{options.CurrentVersion}-{options.Platform}";
+        var updateArchivePath = Path.Combine(releaseAssetsRoot, updateAssetName);
+        var fileMapPath = Path.Combine(releaseAssetsRoot, fileMapAssetName);
+        var fileMapSignaturePath = Path.Combine(releaseAssetsRoot, fileMapSignatureAssetName);
+
+        PayloadUtilities.CreatePayloadZip(objectsRoot, updateArchivePath);
+
+        var metadata = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+        {
+            ["protocol"] = "PLONDS",
+            ["channel"] = options.Channel,
+            ["releaseTag"] = options.CurrentTag,
+            ["baselineTag"] = options.BaselineTag ?? string.Empty,
+            ["baselineVersion"] = options.BaselineVersion ?? "0.0.0",
+            ["targetVersion"] = options.CurrentVersion,
+            ["isFullPayload"] = useFullPayload ? "true" : "false"
+        };
+
+        var component = new ComponentDocument(
+            Name: "app",
+            Version: options.CurrentVersion,
+            Metadata: new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["component"] = "app",
+                ["mode"] = "file-object"
+            },
+            Files: fileEntries);
+
+        var fileMap = new FileMapDocument(
+            FormatVersion: "1.0",
+            DistributionId: distributionId,
+            FromVersion: options.BaselineVersion ?? "0.0.0",
+            ToVersion: options.CurrentVersion,
+            Version: options.CurrentVersion,
+            Platform: options.Platform,
+            Arch: PayloadUtilities.ResolveArch(options.Platform),
+            Channel: options.Channel,
+            GeneratedAt: DateTimeOffset.UtcNow,
+            Metadata: metadata,
+            Components: [component],
+            Files: fileEntries);
+
+        PayloadUtilities.WriteJson(fileMapPath, fileMap);
+        _signer.SignFile(fileMapPath, options.PrivateKeyPath, fileMapSignaturePath);
+
+        var summary = new PlondsReleasePlatformEntry(
+            Platform: options.Platform,
+            DistributionId: distributionId,
+            BaselineTag: options.BaselineTag,
+            BaselineVersion: options.BaselineVersion ?? "0.0.0",
+            TargetVersion: options.CurrentVersion,
+            IsFullPayload: useFullPayload,
+            FilesZipAsset: $"files-{options.Platform}.zip",
+            UpdateZipAsset: updateAssetName,
+            FileMapAsset: fileMapAssetName,
+            FileMapSignatureAsset: fileMapSignatureAssetName,
+            Sha256: PayloadUtilities.ComputeSha256(updateArchivePath));
+
+        var summaryPath = Path.Combine(summaryRoot, $"platform-summary-{options.Platform}.json");
+        PayloadUtilities.WriteJson(summaryPath, summary);
+
+        return new PlondsDeltaBuildResult(
+            options.Platform,
+            distributionId,
+            updateArchivePath,
+            fileMapPath,
+            fileMapSignaturePath,
+            summaryPath,
+            useFullPayload,
+            options.BaselineTag,
+            options.BaselineVersion,
+            options.CurrentVersion);
+    }
+
+    private static List<FileEntryDocument> BuildFileEntries(
+        IReadOnlyDictionary<string, PayloadUtilities.FileFingerprint> previousManifest,
+        IReadOnlyDictionary<string, PayloadUtilities.FileFingerprint> currentManifest,
+        string objectsRoot)
+    {
+        var result = new List<FileEntryDocument>();
+
+        foreach (var path in currentManifest.Keys.OrderBy(static x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            var current = currentManifest[path];
+            if (previousManifest.TryGetValue(path, out var previous) &&
+                string.Equals(current.Sha256, previous.Sha256, StringComparison.OrdinalIgnoreCase))
+            {
+                result.Add(new FileEntryDocument(
+                    Path: path,
+                    Action: "reuse",
+                    Sha256: current.Sha256,
+                    Size: current.Size,
+                    ObjectPath: null,
+                    ObjectKey: null,
+                    Metadata: null));
+                continue;
+            }
+
+            var action = previousManifest.ContainsKey(path) ? "replace" : "add";
+            var objectPath = PayloadUtilities.CopyObject(current.FullPath, objectsRoot, current.Sha256);
+            var metadata = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["mode"] = "file-object"
+            };
+            if (!string.IsNullOrWhiteSpace(current.UnixFileMode))
+            {
+                metadata["unixFileMode"] = current.UnixFileMode!;
+            }
+
+            result.Add(new FileEntryDocument(
+                Path: path,
+                Action: action,
+                Sha256: current.Sha256,
+                Size: current.Size,
+                ObjectPath: objectPath,
+                ObjectKey: objectPath,
+                Metadata: metadata));
+        }
+
+        foreach (var path in previousManifest.Keys.OrderBy(static x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            if (currentManifest.ContainsKey(path))
+            {
+                continue;
+            }
+
+            result.Add(new FileEntryDocument(
+                Path: path,
+                Action: "delete",
+                Sha256: string.Empty,
+                Size: 0,
+                ObjectPath: null,
+                ObjectKey: null,
+                Metadata: null));
+        }
+
+        return result;
+    }
+
+    private sealed record FileMapDocument(
+        string FormatVersion,
+        string DistributionId,
+        string FromVersion,
+        string ToVersion,
+        string Version,
+        string Platform,
+        string Arch,
+        string Channel,
+        DateTimeOffset GeneratedAt,
+        IReadOnlyDictionary<string, string> Metadata,
+        IReadOnlyList<ComponentDocument> Components,
+        IReadOnlyList<FileEntryDocument> Files);
+
+    private sealed record ComponentDocument(
+        string Name,
+        string Version,
+        IReadOnlyDictionary<string, string>? Metadata,
+        IReadOnlyList<FileEntryDocument> Files);
+
+    private sealed record FileEntryDocument(
+        string Path,
+        string Action,
+        string Sha256,
+        long Size,
+        string? ObjectPath,
+        string? ObjectKey,
+        IReadOnlyDictionary<string, string>? Metadata);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsGenerateOptions.cs

@@ -0,0 +1,23 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsGenerateOptions(
+    string CurrentVersion,
+    string CurrentDirectory,
+    string Platform,
+    string OutputRoot,
+    string PreviousVersion = "0.0.0",
+    string? PreviousDirectory = null,
+    string Channel = "stable",
+    string? DistributionId = null,
+    string? RepoBaseUrl = null,
+    string? FileMapUrl = null,
+    string? FileMapSignatureUrl = null,
+    string? InstallerDirectory = null,
+    string? InstallerBaseUrl = null,
+    string IncrementalStrategy = "release-payload",
+    string? BaselineVersion = null,
+    string? BaselineRef = null,
+    string? SourceCommit = null,
+    bool IsFullPayloadRelease = false,
+    string? CommitRangeStart = null,
+    string? CommitRangeEnd = null);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsGenerator.cs

@@ -0,0 +1,375 @@
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsGenerator
+{
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        WriteIndented = true
+    };
+
+    public PlatformPublishResult Generate(PlondsGenerateOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var currentDirectory = Path.GetFullPath(options.CurrentDirectory);
+        if (!Directory.Exists(currentDirectory))
+        {
+            throw new DirectoryNotFoundException($"Current directory not found: {currentDirectory}");
+        }
+
+        var previousDirectory = string.IsNullOrWhiteSpace(options.PreviousDirectory)
+            ? null
+            : Path.GetFullPath(options.PreviousDirectory);
+
+        var distributionId = string.IsNullOrWhiteSpace(options.DistributionId)
+            ? $"plonds-{options.CurrentVersion}-{options.Platform}"
+            : options.DistributionId.Trim();
+
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var repoRoot = Path.Combine(outputRoot, "repo", "sha256");
+        var manifestsRoot = Path.Combine(outputRoot, "manifests", distributionId);
+        var metaDistributionRoot = Path.Combine(outputRoot, "meta", "distributions");
+        var metaChannelRoot = Path.Combine(outputRoot, "meta", "channels", options.Channel, options.Platform);
+        var installerMirrorRoot = Path.Combine(outputRoot, "installers", options.Platform, options.CurrentVersion);
+
+        Directory.CreateDirectory(repoRoot);
+        Directory.CreateDirectory(manifestsRoot);
+        Directory.CreateDirectory(metaDistributionRoot);
+        Directory.CreateDirectory(metaChannelRoot);
+
+        var previousManifest = options.IsFullPayloadRelease
+            ? new Dictionary<string, FileFingerprint>(StringComparer.OrdinalIgnoreCase)
+            : ScanDirectory(previousDirectory);
+        var currentManifest = ScanDirectory(currentDirectory);
+        var fileEntries = BuildFileEntries(previousManifest, currentManifest, repoRoot, options.RepoBaseUrl);
+        var installerMirrors = BuildInstallerMirrors(options.Platform, installerMirrorRoot, options.InstallerDirectory, options.InstallerBaseUrl);
+        var publishedAt = DateTimeOffset.UtcNow;
+        var baselineVersion = string.IsNullOrWhiteSpace(options.BaselineVersion)
+            ? options.PreviousVersion
+            : options.BaselineVersion;
+
+        var fileMap = new FileMapDocument(
+            FormatVersion: "1.0",
+            DistributionId: distributionId,
+            FromVersion: options.PreviousVersion,
+            ToVersion: options.CurrentVersion,
+            Platform: options.Platform,
+            Channel: options.Channel,
+            PublishedAt: publishedAt,
+            Capabilities: ["file-object"],
+            Components:
+            [
+                new ComponentDocument(
+                    Id: "app",
+                    Root: "/",
+                    Mode: "file-object",
+                    Files: fileEntries,
+                    Metadata: new Dictionary<string, string> { ["component"] = "app" })
+            ],
+            Metadata: new Dictionary<string, string>
+            {
+                ["protocol"] = "PLONDS",
+                ["mode"] = "file-object",
+                ["baselineVersion"] = baselineVersion,
+                ["incrementalStrategy"] = options.IncrementalStrategy,
+                ["isFullPayloadRelease"] = options.IsFullPayloadRelease ? "true" : "false",
+                ["sourceCommit"] = options.SourceCommit ?? string.Empty,
+                ["baselineRef"] = options.BaselineRef ?? string.Empty,
+                ["commitRangeStart"] = options.CommitRangeStart ?? string.Empty,
+                ["commitRangeEnd"] = options.CommitRangeEnd ?? string.Empty
+            });
+
+        var distribution = new DistributionDocument(
+            DistributionId: distributionId,
+            Version: options.CurrentVersion,
+            Channel: options.Channel,
+            Platform: options.Platform,
+            PublishedAt: publishedAt,
+            FileMapUrl: options.FileMapUrl,
+            FileMapSignatureUrl: options.FileMapSignatureUrl,
+            Components: fileMap.Components,
+            InstallerMirrors: installerMirrors,
+            Capabilities: ["file-object"],
+            Metadata: new Dictionary<string, string>
+            {
+                ["protocol"] = "PLONDS",
+                ["baselineVersion"] = baselineVersion,
+                ["incrementalStrategy"] = options.IncrementalStrategy,
+                ["isFullPayloadRelease"] = options.IsFullPayloadRelease ? "true" : "false",
+                ["sourceCommit"] = options.SourceCommit ?? string.Empty,
+                ["baselineRef"] = options.BaselineRef ?? string.Empty,
+                ["commitRangeStart"] = options.CommitRangeStart ?? string.Empty,
+                ["commitRangeEnd"] = options.CommitRangeEnd ?? string.Empty
+            });
+
+        var latest = new LatestPointerDocument(
+            DistributionId: distributionId,
+            Version: options.CurrentVersion,
+            Channel: options.Channel,
+            Platform: options.Platform,
+            PublishedAt: publishedAt);
+
+        var fileMapPath = Path.Combine(manifestsRoot, "plonds-filemap.json");
+        var distributionPath = Path.Combine(metaDistributionRoot, distributionId + ".json");
+        var latestPath = Path.Combine(metaChannelRoot, "latest.json");
+
+        WriteJson(fileMapPath, fileMap);
+        WriteJson(distributionPath, distribution);
+        WriteJson(latestPath, latest);
+
+        return new PlatformPublishResult(
+            options.Platform,
+            distributionId,
+            currentDirectory,
+            previousDirectory,
+            options.PreviousVersion,
+            fileMapPath,
+            fileMapPath + ".sig",
+            distributionPath,
+            latestPath,
+            installerMirrors.Select(x => x.FileName ?? string.Empty).Where(x => !string.IsNullOrWhiteSpace(x)).ToArray());
+    }
+
+    private static Dictionary<string, FileFingerprint> ScanDirectory(string? root)
+    {
+        var manifest = new Dictionary<string, FileFingerprint>(StringComparer.OrdinalIgnoreCase);
+        if (string.IsNullOrWhiteSpace(root) || !Directory.Exists(root))
+        {
+            return manifest;
+        }
+
+        var resolvedRoot = Path.GetFullPath(root);
+        foreach (var filePath in Directory.EnumerateFiles(resolvedRoot, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(resolvedRoot, filePath).Replace('\\', '/');
+            if (ShouldIgnore(relativePath))
+            {
+                continue;
+            }
+
+            var fileInfo = new FileInfo(filePath);
+            manifest[relativePath] = new FileFingerprint(relativePath, filePath, ComputeSha256(filePath), fileInfo.Length);
+        }
+
+        return manifest;
+    }
+
+    private static List<FileEntryDocument> BuildFileEntries(
+        Dictionary<string, FileFingerprint> previousManifest,
+        Dictionary<string, FileFingerprint> currentManifest,
+        string repoRoot,
+        string? repoBaseUrl)
+    {
+        var entries = new List<FileEntryDocument>();
+
+        foreach (var path in currentManifest.Keys.OrderBy(x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            var current = currentManifest[path];
+            if (previousManifest.TryGetValue(path, out var previous) &&
+                string.Equals(current.Sha256, previous.Sha256, StringComparison.OrdinalIgnoreCase))
+            {
+                entries.Add(new FileEntryDocument(
+                    Path: path,
+                    Action: "reuse",
+                    Sha256: current.Sha256,
+                    Size: current.Size,
+                    Mode: "file-object",
+                    ObjectKey: null,
+                    ObjectUrl: null,
+                    Metadata: null));
+                continue;
+            }
+
+            var action = previousManifest.ContainsKey(path) ? "replace" : "add";
+            var objectKey = CopyContentObject(current.FullPath, repoRoot, current.Sha256);
+            var objectUrl = string.IsNullOrWhiteSpace(repoBaseUrl)
+                ? null
+                : $"{repoBaseUrl.TrimEnd('/')}/{objectKey}";
+
+            entries.Add(new FileEntryDocument(
+                Path: path,
+                Action: action,
+                Sha256: current.Sha256,
+                Size: current.Size,
+                Mode: "file-object",
+                ObjectKey: objectKey,
+                ObjectUrl: objectUrl,
+                Metadata: new Dictionary<string, string> { ["mode"] = "file-object" }));
+        }
+
+        foreach (var path in previousManifest.Keys.OrderBy(x => x, StringComparer.OrdinalIgnoreCase))
+        {
+            if (!currentManifest.ContainsKey(path))
+            {
+                entries.Add(new FileEntryDocument(
+                    Path: path,
+                    Action: "delete",
+                    Sha256: string.Empty,
+                    Size: 0,
+                    Mode: "file-object",
+                    ObjectKey: null,
+                    ObjectUrl: null,
+                    Metadata: null));
+            }
+        }
+
+        return entries;
+    }
+
+    private static List<InstallerMirrorDocument> BuildInstallerMirrors(
+        string platform,
+        string installerMirrorRoot,
+        string? installerSourceDirectory,
+        string? installerBaseUrl)
+    {
+        var result = new List<InstallerMirrorDocument>();
+        if (string.IsNullOrWhiteSpace(installerSourceDirectory) || !Directory.Exists(installerSourceDirectory))
+        {
+            return result;
+        }
+
+        Directory.CreateDirectory(installerMirrorRoot);
+        foreach (var sourceFile in Directory.EnumerateFiles(installerSourceDirectory))
+        {
+            var fileName = Path.GetFileName(sourceFile);
+            var destinationPath = Path.Combine(installerMirrorRoot, fileName);
+            File.Copy(sourceFile, destinationPath, overwrite: true);
+
+            var url = string.IsNullOrWhiteSpace(installerBaseUrl)
+                ? null
+                : $"{installerBaseUrl.TrimEnd('/')}/{Uri.EscapeDataString(fileName)}";
+            result.Add(new InstallerMirrorDocument(
+                Platform: platform,
+                Arch: ResolveArch(platform),
+                Url: url,
+                Name: fileName,
+                FileName: fileName,
+                Sha256: ComputeSha256(destinationPath),
+                Size: new FileInfo(destinationPath).Length));
+        }
+
+        return result;
+    }
+
+    private static string ResolveArch(string platform)
+    {
+        if (platform.EndsWith("-x86", StringComparison.OrdinalIgnoreCase))
+        {
+            return "x86";
+        }
+
+        if (platform.EndsWith("-arm64", StringComparison.OrdinalIgnoreCase))
+        {
+            return "arm64";
+        }
+
+        return "x64";
+    }
+
+    private static bool ShouldIgnore(string relativePath)
+    {
+        var normalized = relativePath.Trim().Replace('\\', '/');
+        if (string.IsNullOrWhiteSpace(normalized))
+        {
+            return true;
+        }
+
+        return normalized.Equals(".current", StringComparison.OrdinalIgnoreCase) ||
+               normalized.Equals(".partial", StringComparison.OrdinalIgnoreCase) ||
+               normalized.Equals(".destroy", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".current/", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".partial/", StringComparison.OrdinalIgnoreCase) ||
+               normalized.StartsWith(".destroy/", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static string CopyContentObject(string sourcePath, string repoRoot, string sha256)
+    {
+        var prefix = sha256[..Math.Min(2, sha256.Length)];
+        var relativeKey = $"{prefix}/{sha256}";
+        var destinationPath = Path.Combine(repoRoot, prefix, sha256);
+        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+        if (!File.Exists(destinationPath))
+        {
+            File.Copy(sourcePath, destinationPath, overwrite: true);
+        }
+
+        return relativeKey.Replace('\\', '/');
+    }
+
+    private static string ComputeSha256(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        return Convert.ToHexString(SHA256.HashData(stream)).ToLowerInvariant();
+    }
+
+    private static void WriteJson<T>(string path, T value)
+    {
+        var json = JsonSerializer.Serialize(value, JsonOptions);
+        File.WriteAllText(path, json, new UTF8Encoding(false));
+    }
+
+    private sealed record FileFingerprint(string RelativePath, string FullPath, string Sha256, long Size);
+
+    private sealed record FileMapDocument(
+        string FormatVersion,
+        string DistributionId,
+        string FromVersion,
+        string ToVersion,
+        string Platform,
+        string Channel,
+        DateTimeOffset PublishedAt,
+        IReadOnlyList<string> Capabilities,
+        IReadOnlyList<ComponentDocument> Components,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record DistributionDocument(
+        string DistributionId,
+        string Version,
+        string Channel,
+        string Platform,
+        DateTimeOffset PublishedAt,
+        string? FileMapUrl,
+        string? FileMapSignatureUrl,
+        IReadOnlyList<ComponentDocument> Components,
+        IReadOnlyList<InstallerMirrorDocument> InstallerMirrors,
+        IReadOnlyList<string> Capabilities,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record LatestPointerDocument(
+        string DistributionId,
+        string Version,
+        string Channel,
+        string Platform,
+        DateTimeOffset PublishedAt);
+
+    private sealed record ComponentDocument(
+        string Id,
+        string Root,
+        string Mode,
+        IReadOnlyList<FileEntryDocument> Files,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record FileEntryDocument(
+        string Path,
+        string Action,
+        string Sha256,
+        long Size,
+        string Mode,
+        string? ObjectKey,
+        string? ObjectUrl,
+        IReadOnlyDictionary<string, string>? Metadata);
+
+    private sealed record InstallerMirrorDocument(
+        string Platform,
+        string Arch,
+        string? Url,
+        string? Name,
+        string? FileName,
+        string? Sha256,
+        long Size);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsPublishOptions.cs

@@ -0,0 +1,19 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsPublishOptions(
+    string Version,
+    string AppArtifactsRoot,
+    string InstallerArtifactsRoot,
+    string OutputRoot,
+    string PrivateKeyPath,
+    string Channel = "stable",
+    string? BaselineRoot = null,
+    string? RepoBaseUrl = null,
+    string? InstallerBaseUrl = null,
+    string IncrementalStrategy = "release-payload",
+    string? BaselineVersion = null,
+    string? BaselineRef = null,
+    string? SourceCommit = null,
+    bool IsFullPayloadRelease = false,
+    string? CommitRangeStart = null,
+    string? CommitRangeEnd = null);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsPublisher.cs

@@ -0,0 +1,237 @@
+using System.Text;
+using System.Text.Json;
+using Plonds.Core.Security;
+using Plonds.Shared;
+using Plonds.Shared.Models;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsPublisher
+{
+    private static readonly PlatformConfig[] SupportedPlatforms =
+    [
+        new("windows-x64", "app-payload-windows-x64", [".exe"], ["x64"]),
+        new("windows-x86", "app-payload-windows-x86", [".exe"], ["x86"]),
+        new("linux-x64", "app-payload-linux-x64", [".deb"], ["linux", "x64"])
+    ];
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        WriteIndented = true
+    };
+
+    private readonly PlondsGenerator _generator = new();
+    private readonly RsaFileSigner _signer = new();
+
+    public IReadOnlyList<PlatformPublishResult> Publish(PlondsPublishOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var results = new List<PlatformPublishResult>();
+        var releaseAssetsRoot = Path.Combine(Path.GetFullPath(options.OutputRoot), "release-assets");
+        Directory.CreateDirectory(releaseAssetsRoot);
+
+        foreach (var config in SupportedPlatforms)
+        {
+            var artifactRoot = Path.Combine(Path.GetFullPath(options.AppArtifactsRoot), config.ArtifactName);
+            if (!Directory.Exists(artifactRoot))
+            {
+                throw new DirectoryNotFoundException($"App payload artifact root not found for {config.Platform}: {artifactRoot}");
+            }
+
+            var currentAppDirectory = FindCurrentAppDirectory(artifactRoot, options.Version);
+            if (currentAppDirectory is null)
+            {
+                throw new DirectoryNotFoundException($"Unable to locate app payload directory for {config.Platform} under {artifactRoot}");
+            }
+
+            var baselineRoot = string.IsNullOrWhiteSpace(options.BaselineRoot)
+                ? Path.Combine(Path.GetFullPath(options.OutputRoot), "_baselines")
+                : Path.GetFullPath(options.BaselineRoot);
+            var platformBaselineRoot = Path.Combine(baselineRoot, config.Platform);
+            var previousDirectory = Path.Combine(platformBaselineRoot, "current");
+            var previousVersionPath = Path.Combine(platformBaselineRoot, "version.txt");
+            Directory.CreateDirectory(platformBaselineRoot);
+            if (!Directory.Exists(previousDirectory))
+            {
+                Directory.CreateDirectory(previousDirectory);
+            }
+
+            var previousVersion = File.Exists(previousVersionPath)
+                ? File.ReadAllText(previousVersionPath).Trim()
+                : "0.0.0";
+
+            var installerSourceDirectory = PrepareInstallerMirrorInput(
+                config,
+                options.InstallerArtifactsRoot,
+                Path.Combine(platformBaselineRoot, "installers"));
+
+            var distributionId = $"plonds-{options.Version}-{config.Platform}";
+            var repoBaseUrl = options.RepoBaseUrl;
+            var fileMapUrl = repoBaseUrl is null
+                ? null
+                : $"{repoBaseUrl.TrimEnd('/').Replace("/repo/sha256", "/manifests")}/{distributionId}/plonds-filemap.json";
+            var fileMapSignatureUrl = fileMapUrl is null ? null : fileMapUrl + ".sig";
+            var installerBaseUrl = string.IsNullOrWhiteSpace(options.InstallerBaseUrl)
+                ? null
+                : $"{options.InstallerBaseUrl.TrimEnd('/')}/{config.Platform}/{options.Version}";
+
+            var result = _generator.Generate(new PlondsGenerateOptions(
+                CurrentVersion: options.Version,
+                CurrentDirectory: currentAppDirectory,
+                Platform: config.Platform,
+                OutputRoot: options.OutputRoot,
+                PreviousVersion: string.IsNullOrWhiteSpace(options.BaselineVersion) ? previousVersion : options.BaselineVersion,
+                PreviousDirectory: previousDirectory,
+                Channel: options.Channel,
+                DistributionId: distributionId,
+                RepoBaseUrl: repoBaseUrl,
+                FileMapUrl: fileMapUrl,
+                FileMapSignatureUrl: fileMapSignatureUrl,
+                InstallerDirectory: installerSourceDirectory,
+                InstallerBaseUrl: installerBaseUrl,
+                IncrementalStrategy: options.IncrementalStrategy,
+                BaselineVersion: string.IsNullOrWhiteSpace(options.BaselineVersion) ? previousVersion : options.BaselineVersion,
+                BaselineRef: options.BaselineRef,
+                SourceCommit: options.SourceCommit,
+                IsFullPayloadRelease: options.IsFullPayloadRelease,
+                CommitRangeStart: options.CommitRangeStart,
+                CommitRangeEnd: options.CommitRangeEnd));
+
+            _signer.SignFile(result.FileMapPath, options.PrivateKeyPath, result.SignaturePath);
+
+            CopyReleaseAsset(result.FileMapPath, Path.Combine(releaseAssetsRoot, $"plonds-filemap-{config.Platform}.json"));
+            CopyReleaseAsset(result.SignaturePath, Path.Combine(releaseAssetsRoot, $"plonds-filemap-{config.Platform}.json.sig"));
+            CopyReleaseAsset(result.DistributionPath, Path.Combine(releaseAssetsRoot, $"plonds-distribution-{config.Platform}.json"));
+            CopyReleaseAsset(result.LatestPath, Path.Combine(releaseAssetsRoot, $"plonds-latest-{config.Platform}.json"));
+
+            MirrorBaseline(currentAppDirectory, previousDirectory, previousVersionPath, options.Version);
+            results.Add(result);
+        }
+
+        WriteMetadataCatalog(options, results);
+        return results;
+    }
+
+    private static void WriteMetadataCatalog(PlondsPublishOptions options, IReadOnlyList<PlatformPublishResult> results)
+    {
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var metadataRoot = Path.Combine(outputRoot, "meta");
+        Directory.CreateDirectory(metadataRoot);
+
+        var generatedAt = DateTimeOffset.UtcNow;
+        var latestPointers = results
+            .Select(result => new PlondsChannelPointer(
+                Channel: options.Channel,
+                Platform: result.Platform,
+                DistributionId: result.DistributionId,
+                Version: options.Version,
+                PublishedAt: generatedAt,
+                DistributionPath: $"distributions/{result.DistributionId}.json",
+                FileMapPath: $"../manifests/{result.DistributionId}/plonds-filemap.json"))
+            .OrderBy(pointer => pointer.Channel, StringComparer.OrdinalIgnoreCase)
+            .ThenBy(pointer => pointer.Platform, StringComparer.OrdinalIgnoreCase)
+            .ToArray();
+
+        var catalog = new PlondsMetadataCatalog(
+            ProtocolName: PlondsConstants.ProtocolName,
+            ProtocolVersion: PlondsConstants.ProtocolVersion,
+            StorageRoot: outputRoot,
+            MetaRoot: metadataRoot,
+            Latest: latestPointers,
+            Metadata: new Dictionary<string, string>
+            {
+                ["generatedBy"] = "Plonds.Tool",
+                ["channel"] = options.Channel,
+                ["generatedAt"] = generatedAt.ToString("O")
+            });
+
+        var metadataPath = Path.Combine(metadataRoot, "metadata.json");
+        File.WriteAllText(metadataPath, JsonSerializer.Serialize(catalog, JsonOptions), new UTF8Encoding(false));
+    }
+
+    private static void MirrorBaseline(string currentAppDirectory, string previousDirectory, string previousVersionPath, string version)
+    {
+        if (Directory.Exists(previousDirectory))
+        {
+            Directory.Delete(previousDirectory, recursive: true);
+        }
+
+        CopyDirectory(currentAppDirectory, previousDirectory);
+        File.WriteAllText(previousVersionPath, version);
+    }
+
+    private static string? FindCurrentAppDirectory(string artifactRoot, string version)
+    {
+        var preferred = Directory.EnumerateDirectories(artifactRoot, $"app-{version}", SearchOption.AllDirectories).FirstOrDefault();
+        if (preferred is not null)
+        {
+            return preferred;
+        }
+
+        return Directory.EnumerateDirectories(artifactRoot, "app-*", SearchOption.AllDirectories)
+            .OrderBy(x => x, StringComparer.OrdinalIgnoreCase)
+            .FirstOrDefault();
+    }
+
+    private static string PrepareInstallerMirrorInput(PlatformConfig config, string installerArtifactsRoot, string destinationRoot)
+    {
+        var installerFiles = FindInstallerFiles(config, installerArtifactsRoot);
+        if (Directory.Exists(destinationRoot))
+        {
+            Directory.Delete(destinationRoot, recursive: true);
+        }
+        Directory.CreateDirectory(destinationRoot);
+
+        foreach (var file in installerFiles)
+        {
+            File.Copy(file, Path.Combine(destinationRoot, Path.GetFileName(file)), overwrite: true);
+        }
+
+        return destinationRoot;
+    }
+
+    private static List<string> FindInstallerFiles(PlatformConfig config, string installerArtifactsRoot)
+    {
+        var files = Directory.EnumerateFiles(Path.GetFullPath(installerArtifactsRoot), "*", SearchOption.AllDirectories);
+        return files
+            .Where(file => config.InstallerExtensions.Contains(Path.GetExtension(file), StringComparer.OrdinalIgnoreCase))
+            .Where(file =>
+            {
+                var fileName = Path.GetFileName(file);
+                return config.FileNameTokens.All(token => fileName.Contains(token, StringComparison.OrdinalIgnoreCase));
+            })
+            .ToList();
+    }
+
+    private static void CopyReleaseAsset(string sourcePath, string destinationPath)
+    {
+        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+        File.Copy(sourcePath, destinationPath, overwrite: true);
+    }
+
+    private static void CopyDirectory(string sourceDir, string destinationDir)
+    {
+        Directory.CreateDirectory(destinationDir);
+        foreach (var directory in Directory.EnumerateDirectories(sourceDir, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(sourceDir, directory);
+            Directory.CreateDirectory(Path.Combine(destinationDir, relativePath));
+        }
+
+        foreach (var file in Directory.EnumerateFiles(sourceDir, "*", SearchOption.AllDirectories))
+        {
+            var relativePath = Path.GetRelativePath(sourceDir, file);
+            var destinationPath = Path.Combine(destinationDir, relativePath);
+            Directory.CreateDirectory(Path.GetDirectoryName(destinationPath)!);
+            File.Copy(file, destinationPath, overwrite: true);
+        }
+    }
+
+    private sealed record PlatformConfig(
+        string Platform,
+        string ArtifactName,
+        IReadOnlyList<string> InstallerExtensions,
+        IReadOnlyList<string> FileNameTokens);
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsReleaseIndexBuilder.cs

@@ -0,0 +1,57 @@
+using System.Text.Json;
+using Plonds.Core.Security;
+using Plonds.Shared.Models;
+
+namespace Plonds.Core.Publishing;
+
+public sealed class PlondsReleaseIndexBuilder
+{
+    private readonly RsaFileSigner _signer = new();
+
+    public string Build(PlondsReleaseIndexOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        var summariesDirectory = Path.GetFullPath(options.PlatformSummariesDirectory);
+        if (!Directory.Exists(summariesDirectory))
+        {
+            throw new DirectoryNotFoundException($"Platform summary directory not found: {summariesDirectory}");
+        }
+
+        var summaries = Directory
+            .EnumerateFiles(summariesDirectory, "platform-summary-*.json", SearchOption.TopDirectoryOnly)
+            .OrderBy(static path => path, StringComparer.OrdinalIgnoreCase)
+            .Select(ReadSummary)
+            .OrderBy(static entry => entry.Platform, StringComparer.OrdinalIgnoreCase)
+            .ToArray();
+
+        var manifest = new PlondsReleaseManifest(
+            FormatVersion: "1.0",
+            ReleaseTag: options.ReleaseTag,
+            Version: options.Version,
+            Channel: options.Channel,
+            GeneratedAt: DateTimeOffset.UtcNow,
+            Platforms: summaries);
+
+        var outputRoot = Path.GetFullPath(options.OutputRoot);
+        var releaseAssetsRoot = Path.Combine(outputRoot, "release-assets");
+        Directory.CreateDirectory(releaseAssetsRoot);
+
+        var manifestPath = Path.Combine(releaseAssetsRoot, "plonds.json");
+        PayloadUtilities.WriteJson(manifestPath, manifest);
+        _signer.SignFile(manifestPath, options.PrivateKeyPath, manifestPath + ".sig");
+        return manifestPath;
+    }
+
+    private static PlondsReleasePlatformEntry ReadSummary(string path)
+    {
+        var json = File.ReadAllText(path);
+        var summary = JsonSerializer.Deserialize<PlondsReleasePlatformEntry>(json, PayloadUtilities.JsonOptions);
+        if (summary is null)
+        {
+            throw new InvalidOperationException($"Unable to deserialize PLONDS platform summary: {path}");
+        }
+
+        return summary;
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Publishing/PlondsReleaseIndexOptions.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Core.Publishing;
+
+public sealed record PlondsReleaseIndexOptions(
+    string ReleaseTag,
+    string Version,
+    string Channel,
+    string PlatformSummariesDirectory,
+    string OutputRoot,
+    string PrivateKeyPath);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Core/Security/RsaFileSigner.cs

@@ -0,0 +1,38 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Plonds.Core.Security;
+
+public sealed class RsaFileSigner
+{
+    public string SignFile(string filePath, string privateKeyPath, string? outputPath = null)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(filePath);
+        ArgumentException.ThrowIfNullOrWhiteSpace(privateKeyPath);
+
+        if (!File.Exists(filePath))
+        {
+            throw new FileNotFoundException("Manifest file not found.", filePath);
+        }
+
+        if (!File.Exists(privateKeyPath))
+        {
+            throw new FileNotFoundException("Private key PEM file not found.", privateKeyPath);
+        }
+
+        outputPath ??= filePath + ".sig";
+
+        var payload = File.ReadAllBytes(filePath);
+        var privateKeyPem = File.ReadAllText(privateKeyPath, Encoding.ASCII);
+        if (string.IsNullOrWhiteSpace(privateKeyPem))
+        {
+            throw new InvalidOperationException("Private key PEM is empty.");
+        }
+
+        using var rsa = RSA.Create();
+        rsa.ImportFromPem(privateKeyPem);
+        var signature = rsa.SignData(payload, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
+        File.WriteAllText(outputPath, Convert.ToBase64String(signature), Encoding.ASCII);
+        return outputPath;
+    }
+}

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/DdssAssetEntry.cs

@@ -0,0 +1,8 @@
+namespace Plonds.Shared.Models;
+
+public sealed record DdssAssetEntry(
+    string AssetId,
+    string FileName,
+    string Sha256,
+    long Size,
+    IReadOnlyList<DdssMirrorEntry> Mirrors);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/DdssManifest.cs

@@ -0,0 +1,7 @@
+namespace Plonds.Shared.Models;
+
+public sealed record DdssManifest(
+    string FormatVersion,
+    string ReleaseTag,
+    DateTimeOffset GeneratedAt,
+    IReadOnlyList<DdssAssetEntry> Assets);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/DdssMirrorEntry.cs

@@ -0,0 +1,5 @@
+namespace Plonds.Shared.Models;
+
+public sealed record DdssMirrorEntry(
+    string Type,
+    string Url);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsChannelPointer.cs

@@ -0,0 +1,11 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsChannelPointer(
+    string Channel,
+    string Platform,
+    string DistributionId,
+    string Version,
+    DateTimeOffset PublishedAt,
+    string? DistributionPath = null,
+    string? FileMapPath = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsComponent.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsComponent(
+    string Id,
+    string Root,
+    string Mode,
+    IReadOnlyList<PlondsFileEntry> Files,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsDistributionInfo.cs

@@ -0,0 +1,14 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsDistributionInfo(
+    string DistributionId,
+    string Version,
+    string Channel,
+    string Platform,
+    DateTimeOffset PublishedAt,
+    IReadOnlyList<PlondsComponent> Components,
+    IReadOnlyList<PlondsMirrorAsset> InstallerMirrors,
+    IReadOnlyList<string> Capabilities,
+    IReadOnlyList<PlondsSignatureDescriptor> Signatures,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsFileEntry.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsFileEntry(
+    string Path,
+    string Op,
+    string ContentHash,
+    long Size,
+    string Mode,
+    string? ObjectKey = null,
+    string? Compression = null,
+    string? PatchBaseHash = null,
+    string? PatchObjectKey = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsFileMap.cs

@@ -0,0 +1,13 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsFileMap(
+    string FormatVersion,
+    string DistributionId,
+    string SourceVersion,
+    string TargetVersion,
+    string Platform,
+    IReadOnlyList<PlondsComponent> Components,
+    IReadOnlyList<string> Capabilities,
+    IReadOnlyList<PlondsSignatureDescriptor> Signatures,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsMetadataCatalog.cs

@@ -0,0 +1,10 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsMetadataCatalog(
+    string ProtocolName,
+    string ProtocolVersion,
+    string StorageRoot,
+    string MetaRoot,
+    IReadOnlyList<PlondsChannelPointer> Latest,
+    IReadOnlyDictionary<string, string>? Metadata = null);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsMirrorAsset.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsMirrorAsset(
+    string Platform,
+    string Arch,
+    string Url,
+    string? FileName = null,
+    string? Sha256 = null,
+    long Size = 0);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsReleaseManifest.cs

@@ -0,0 +1,9 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsReleaseManifest(
+    string FormatVersion,
+    string ReleaseTag,
+    string Version,
+    string Channel,
+    DateTimeOffset GeneratedAt,
+    IReadOnlyList<PlondsReleasePlatformEntry> Platforms);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsReleasePlatformEntry.cs

@@ -0,0 +1,14 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsReleasePlatformEntry(
+    string Platform,
+    string DistributionId,
+    string? BaselineTag,
+    string? BaselineVersion,
+    string TargetVersion,
+    bool IsFullPayload,
+    string FilesZipAsset,
+    string UpdateZipAsset,
+    string FileMapAsset,
+    string FileMapSignatureAsset,
+    string Sha256);

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Models/PlondsSignatureDescriptor.cs

@@ -0,0 +1,7 @@
+namespace Plonds.Shared.Models;
+
+public sealed record PlondsSignatureDescriptor(
+    string Algorithm,
+    string KeyId,
+    string Signature);
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/Plonds.Shared.csproj

@@ -0,0 +1,6 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <RootNamespace>Plonds.Shared</RootNamespace>
+  </PropertyGroup>
+</Project>
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/PlondsConstants.cs

@@ -0,0 +1,25 @@
+namespace Plonds.Shared;
+
+public static class PlondsConstants
+{
+    public const string ProtocolName = "PLONDS";
+    public const string ProtocolVersion = "1.0";
+
+    public const string DefaultApiBasePath = "/api/plonds/v1";
+    public const string DefaultStorageRoot = "sample-data";
+    public const string DefaultMetaRoot = "meta";
+    public const string DefaultRepoRoot = "repo";
+    public const string DefaultInstallersRoot = "installers";
+
+    public const string FileObjectMode = "file-object";
+    public const string CompressedObjectMode = "compressed-object";
+    public const string BinaryPatchMode = "binary-patch";
+
+    public static readonly string[] SupportedFileModes =
+    [
+        FileObjectMode,
+        CompressedObjectMode,
+        BinaryPatchMode
+    ];
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Shared/PlondsFileOperation.cs

@@ -0,0 +1,10 @@
+namespace Plonds.Shared;
+
+public enum PlondsFileOperation
+{
+    Add,
+    Replace,
+    Reuse,
+    Delete
+}
+

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Plonds.Tool.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Plonds.Core\Plonds.Core.csproj" />
+    <ProjectReference Include="..\Plonds.Shared\Plonds.Shared.csproj" />
+  </ItemGroup>
+</Project>

PenguinLogisticsOnlineNetworkDistributionSystem/src/Plonds.Tool/Program.cs

@@ -0,0 +1,221 @@
+using Plonds.Core.Publishing;
+using Plonds.Core.Security;
+
+return await PlondsCli.RunAsync(args);
+
+internal static class PlondsCli
+{
+    public static Task<int> RunAsync(string[] args)
+    {
+        if (args.Length == 0)
+        {
+            PrintUsage();
+            return Task.FromResult(1);
+        }
+
+        var command = args[0].Trim().ToLowerInvariant();
+        var options = ParseOptions(args.Skip(1).ToArray());
+
+        try
+        {
+            switch (command)
+            {
+                case "generate":
+                    RunGenerate(options);
+                    return Task.FromResult(0);
+                case "sign":
+                    RunSign(options);
+                    return Task.FromResult(0);
+                case "publish":
+                    RunPublish(options);
+                    return Task.FromResult(0);
+                case "pack-payload":
+                    RunPackPayload(options);
+                    return Task.FromResult(0);
+                case "build-delta":
+                    RunBuildDelta(options);
+                    return Task.FromResult(0);
+                case "build-index":
+                    RunBuildIndex(options);
+                    return Task.FromResult(0);
+                case "build-ddss":
+                    RunBuildDdss(options);
+                    return Task.FromResult(0);
+                default:
+                    Console.Error.WriteLine($"Unknown command: {command}");
+                    PrintUsage();
+                    return Task.FromResult(1);
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine(ex.Message);
+            return Task.FromResult(1);
+        }
+    }
+
+    private static void RunGenerate(Dictionary<string, string> options)
+    {
+        var generator = new PlondsGenerator();
+        var result = generator.Generate(new PlondsGenerateOptions(
+            CurrentVersion: Require(options, "current-version"),
+            CurrentDirectory: Require(options, "current-dir"),
+            Platform: Require(options, "platform"),
+            OutputRoot: Require(options, "output-dir"),
+            PreviousVersion: Get(options, "previous-version", "0.0.0") ?? "0.0.0",
+            PreviousDirectory: Get(options, "previous-dir"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            DistributionId: Get(options, "distribution-id"),
+            RepoBaseUrl: Get(options, "repo-base-url"),
+            FileMapUrl: Get(options, "file-map-url"),
+            FileMapSignatureUrl: Get(options, "file-map-signature-url"),
+            InstallerDirectory: Get(options, "installer-directory"),
+            InstallerBaseUrl: Get(options, "installer-base-url")));
+
+        Console.WriteLine($"Generated PLONDS artifacts for {result.Platform}: {result.DistributionId}");
+        Console.WriteLine(result.FileMapPath);
+    }
+
+    private static void RunSign(Dictionary<string, string> options)
+    {
+        var signer = new RsaFileSigner();
+        var signaturePath = signer.SignFile(
+            Require(options, "manifest"),
+            Require(options, "private-key"),
+            Get(options, "output"));
+        Console.WriteLine(signaturePath);
+    }
+
+    private static void RunPublish(Dictionary<string, string> options)
+    {
+        var publisher = new PlondsPublisher();
+        var results = publisher.Publish(new PlondsPublishOptions(
+            Version: Require(options, "version"),
+            AppArtifactsRoot: Require(options, "app-artifacts-root"),
+            InstallerArtifactsRoot: Require(options, "installer-artifacts-root"),
+            OutputRoot: Require(options, "output-dir"),
+            PrivateKeyPath: Require(options, "private-key"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            BaselineRoot: Get(options, "baseline-root"),
+            RepoBaseUrl: Get(options, "repo-base-url"),
+            InstallerBaseUrl: Get(options, "installer-base-url"),
+            IncrementalStrategy: Get(options, "incremental-strategy", "release-payload") ?? "release-payload",
+            BaselineVersion: Get(options, "baseline-version"),
+            BaselineRef: Get(options, "baseline-ref"),
+            SourceCommit: Get(options, "source-commit"),
+            IsFullPayloadRelease: bool.TryParse(Get(options, "is-full-payload-release", "false"), out var isFullPayloadRelease) && isFullPayloadRelease,
+            CommitRangeStart: Get(options, "commit-range-start"),
+            CommitRangeEnd: Get(options, "commit-range-end")));
+
+        foreach (var result in results)
+        {
+            Console.WriteLine($"{result.Platform}: {result.DistributionId}");
+        }
+    }
+
+    private static void RunPackPayload(Dictionary<string, string> options)
+    {
+        var sourceDirectory = Require(options, "source-dir");
+        var outputZip = Require(options, "output-zip");
+        PayloadUtilities.CreatePayloadZip(sourceDirectory, outputZip);
+        Console.WriteLine(outputZip);
+    }
+
+    private static void RunBuildDelta(Dictionary<string, string> options)
+    {
+        var builder = new PlondsDeltaBuilder();
+        var result = builder.Build(new PlondsDeltaBuildOptions(
+            Platform: Require(options, "platform"),
+            CurrentVersion: Require(options, "current-version"),
+            CurrentTag: Require(options, "current-tag"),
+            CurrentPayloadZip: Require(options, "current-zip"),
+            OutputRoot: Require(options, "output-dir"),
+            PrivateKeyPath: Require(options, "private-key"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            BaselineVersion: Get(options, "baseline-version"),
+            BaselineTag: Get(options, "baseline-tag"),
+            BaselinePayloadZip: Get(options, "baseline-zip"),
+            IsFullPayload: bool.TryParse(Get(options, "is-full-payload", "false"), out var isFullPayload) && isFullPayload));
+
+        Console.WriteLine($"Built PLONDS delta for {result.Platform}: {result.UpdateArchivePath}");
+        Console.WriteLine(result.FileMapPath);
+    }
+
+    private static void RunBuildIndex(Dictionary<string, string> options)
+    {
+        var builder = new PlondsReleaseIndexBuilder();
+        var manifestPath = builder.Build(new PlondsReleaseIndexOptions(
+            ReleaseTag: Require(options, "release-tag"),
+            Version: Require(options, "version"),
+            Channel: Get(options, "channel", "stable") ?? "stable",
+            PlatformSummariesDirectory: Require(options, "platform-summaries-dir"),
+            OutputRoot: Require(options, "output-dir"),
+            PrivateKeyPath: Require(options, "private-key")));
+
+        Console.WriteLine(manifestPath);
+    }
+
+    private static void RunBuildDdss(Dictionary<string, string> options)
+    {
+        var builder = new DdssManifestBuilder();
+        var manifestPath = builder.Build(new DdssBuildOptions(
+            ReleaseTag: Require(options, "release-tag"),
+            AssetsDirectory: Require(options, "assets-dir"),
+            OutputRoot: Require(options, "output-dir"),
+            PrivateKeyPath: Require(options, "private-key"),
+            Repository: Require(options, "repository"),
+            S3BaseUrl: Get(options, "s3-base-url")));
+
+        Console.WriteLine(manifestPath);
+    }
+
+    private static Dictionary<string, string> ParseOptions(string[] args)
+    {
+        var result = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        for (var index = 0; index < args.Length; index++)
+        {
+            var token = args[index];
+            if (!token.StartsWith("--", StringComparison.Ordinal))
+            {
+                continue;
+            }
+
+            var key = token[2..];
+            var value = index + 1 < args.Length && !args[index + 1].StartsWith("--", StringComparison.Ordinal)
+                ? args[++index]
+                : "true";
+            result[key] = value;
+        }
+
+        return result;
+    }
+
+    private static string Require(IReadOnlyDictionary<string, string> options, string key)
+    {
+        if (options.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value))
+        {
+            return value;
+        }
+
+        throw new InvalidOperationException($"Missing required option --{key}");
+    }
+
+    private static string? Get(IReadOnlyDictionary<string, string> options, string key, string? defaultValue = null)
+    {
+        return options.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value)
+            ? value
+            : defaultValue;
+    }
+
+    private static void PrintUsage()
+    {
+        Console.WriteLine("PLONDS Tool");
+        Console.WriteLine("  pack-payload --source-dir <dir> --output-zip <file>");
+        Console.WriteLine("  build-delta --platform <platform> --current-version <v> --current-tag <tag> --current-zip <file> --output-dir <dir> --private-key <pem> [--baseline-tag <tag>] [--baseline-version <v>] [--baseline-zip <file>] [--is-full-payload]");
+        Console.WriteLine("  build-index --release-tag <tag> --version <v> --platform-summaries-dir <dir> --output-dir <dir> --private-key <pem> [--channel <channel>]");
+        Console.WriteLine("  build-ddss --release-tag <tag> --assets-dir <dir> --output-dir <dir> --private-key <pem> --repository <owner/repo> [--s3-base-url <url>]");
+        Console.WriteLine("  sign --manifest <file> --private-key <pem> [--output <file>]");
+        Console.WriteLine("  generate --current-version <v> --current-dir <dir> --platform <platform> --output-dir <dir> [--previous-version <v>] [--previous-dir <dir>]");
+        Console.WriteLine("  publish --version <v> --app-artifacts-root <dir> --installer-artifacts-root <dir> --output-dir <dir> --private-key <pem> [--baseline-root <dir>]");
+    }
+}

phainon.yml

@@ -1,7 +1,5 @@
-# Phainon Distribution Center (PDC) publish configuration
+# Phainon Distribution Center Client Configuration
-# This file is intentionally conservative: Launcher remains installer/rollback authority.
 name: "LanMountainDesktop"
-
 components:
   app:
     allowDiffUpdate: true
@@ -13,17 +11,22 @@ components:
     includes:
       - "**"
     excludes:
-      - "app-*/**"
+      - "app*/**"
-      - ".launcher/update/incoming/**"
+      - "files*.json"
-      - "files.json"
+      - "files*.json.sig"
-      - "files.json.sig"
+      - "update*.zip"
-      - "update.zip"
-
 variables:
   number: 0
+fileRepoRoot: "__FILE_REPO_ROOT__"
+archiveRoot: "__ARCHIVE_ROOT__/$(primaryVersion)/$(version)/"
+bucketKeyRoot: "lanmountain/update/repo/"
+archiveBucketKeyRoot: "lanmountain/update/archive/$(primaryVersion)/$(version)/"
+appChangeLogPath: "$(thisFileDir)/../CHANGELOG.md"
+appChangeLogTemplate: |
+  $(changeLog)
 
-# Replace these roots in CI/CD or environment-specific templates when enabling PDCC publish.
+  ---
-fileRepoRoot: "https://example.invalid/lanmountain/distribution-v1/repo/"
+
-archiveRoot: "https://example.invalid/lanmountain/distribution-v1/$(primaryVersion)/$(version)/"
+  ## Checksums And Downloads
-bucketKeyRoot: "lanmountain/distribution-v1/repo/"
+
-archiveBucketKeyRoot: "lanmountain/distribution-v1/$(primaryVersion)/$(version)/"
+  $(hashes)

scripts/Generate-PlondsArtifacts.ps1

@@ -0,0 +1,87 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$CurrentVersion,
+
+    [Parameter(Mandatory = $true)]
+    [string]$CurrentDir,
+
+    [Parameter(Mandatory = $true)]
+    [string]$Platform,
+
+    [Parameter(Mandatory = $true)]
+    [string]$OutputDir,
+
+    [Parameter(Mandatory = $false)]
+    [string]$PreviousVersion = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$PreviousDir = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$Channel = "stable",
+
+    [Parameter(Mandatory = $false)]
+    [string]$DistributionId = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$RepoBaseUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$FileMapUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$FileMapSignatureUrl = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$InstallerDirectory = "",
+
+    [Parameter(Mandatory = $false)]
+    [string]$InstallerBaseUrl = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+$toolProject = Join-Path $PSScriptRoot "..\PenguinLogisticsOnlineNetworkDistributionSystem\src\Plonds.Tool\Plonds.Tool.csproj"
+if (-not (Test-Path -LiteralPath $toolProject)) {
+    throw "PLONDS tool project not found: $toolProject"
+}
+
+$arguments = @(
+    "run",
+    "--project", $toolProject,
+    "--",
+    "generate",
+    "--current-version", $CurrentVersion,
+    "--current-dir", $CurrentDir,
+    "--platform", $Platform,
+    "--output-dir", $OutputDir,
+    "--previous-version", $(if ([string]::IsNullOrWhiteSpace($PreviousVersion)) { "0.0.0" } else { $PreviousVersion }),
+    "--channel", $Channel
+)
+
+if (-not [string]::IsNullOrWhiteSpace($PreviousDir)) {
+    $arguments += @("--previous-dir", $PreviousDir)
+}
+if (-not [string]::IsNullOrWhiteSpace($DistributionId)) {
+    $arguments += @("--distribution-id", $DistributionId)
+}
+if (-not [string]::IsNullOrWhiteSpace($RepoBaseUrl)) {
+    $arguments += @("--repo-base-url", $RepoBaseUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($FileMapUrl)) {
+    $arguments += @("--file-map-url", $FileMapUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($FileMapSignatureUrl)) {
+    $arguments += @("--file-map-signature-url", $FileMapSignatureUrl)
+}
+if (-not [string]::IsNullOrWhiteSpace($InstallerDirectory)) {
+    $arguments += @("--installer-directory", $InstallerDirectory)
+}
+if (-not [string]::IsNullOrWhiteSpace($InstallerBaseUrl)) {
+    $arguments += @("--installer-base-url", $InstallerBaseUrl)
+}
+
+& dotnet @arguments
+if ($LASTEXITCODE -ne 0) {
+    throw "PLONDS generate command failed."
+}

scripts/Install-Pdcc.ps1

@@ -0,0 +1,97 @@
+param(
+    [string]$Repository = "ClassIsland/PhainonDistributionCenter",
+    [string]$AssetName = "out_app_linux_x64.zip",
+    [string]$Version = "",
+    [string]$OutputDir = (Join-Path $PSScriptRoot "..\pdcc")
+)
+
+$ErrorActionPreference = "Stop"
+
+if ([string]::IsNullOrWhiteSpace($Repository)) {
+    throw "Repository is required."
+}
+
+if ([string]::IsNullOrWhiteSpace($AssetName)) {
+    throw "AssetName is required."
+}
+
+$OutputDir = [System.IO.Path]::GetFullPath($OutputDir)
+if (-not (Test-Path -LiteralPath $OutputDir)) {
+    New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
+}
+
+$clientName = if ($env:OS -eq "Windows_NT") { "PhainonDistributionCenter.Client.exe" } else { "PhainonDistributionCenter.Client" }
+$clientPath = Join-Path $OutputDir $clientName
+if (Test-Path -LiteralPath $clientPath) {
+    Write-Host "PDCC client already installed at $clientPath"
+    return
+}
+
+$releaseTag = $Version
+if ([string]::IsNullOrWhiteSpace($releaseTag)) {
+    $releaseTag = $env:PDC_CLIENT_VERSION
+}
+
+if ([string]::IsNullOrWhiteSpace($releaseTag)) {
+    $releaseTag = $env:PDCC_VERSION
+}
+
+$tempDir = Join-Path $env:RUNNER_TEMP "pdcc-install"
+if (Test-Path -LiteralPath $tempDir) {
+    Remove-Item -LiteralPath $tempDir -Recurse -Force
+}
+New-Item -ItemType Directory -Path $tempDir -Force | Out-Null
+
+$zipPath = Join-Path $tempDir $AssetName
+
+if (Get-Command gh -ErrorAction SilentlyContinue) {
+    Write-Host "Downloading PDCC via gh release download from $Repository ..."
+    $ghArgs = @("release", "download", "--repo", $Repository, "--pattern", $AssetName, "--dir", $tempDir, "--clobber")
+    if (-not [string]::IsNullOrWhiteSpace($releaseTag)) {
+        $ghArgs = @("release", "download", $releaseTag, "--repo", $Repository, "--pattern", $AssetName, "--dir", $tempDir, "--clobber")
+    }
+
+    & gh @ghArgs
+    if ($LASTEXITCODE -ne 0) {
+        throw "gh release download failed for $Repository/$AssetName."
+    }
+}
+else {
+    if ([string]::IsNullOrWhiteSpace($releaseTag)) {
+        throw "PDCC_VERSION is required when gh is unavailable."
+    }
+
+    $downloadUrl = "https://github.com/$Repository/releases/download/$releaseTag/$AssetName"
+    Write-Host "Downloading PDCC from $downloadUrl ..."
+    Invoke-WebRequest -Uri $downloadUrl -OutFile $zipPath
+}
+
+$extractDir = Join-Path $tempDir "extract"
+if (Test-Path -LiteralPath $extractDir) {
+    Remove-Item -LiteralPath $extractDir -Recurse -Force
+}
+New-Item -ItemType Directory -Path $extractDir -Force | Out-Null
+Expand-Archive -LiteralPath $zipPath -DestinationPath $extractDir -Force
+
+$copied = $false
+foreach ($file in Get-ChildItem -LiteralPath $extractDir -Recurse -File) {
+    if ($file.Name -ieq $clientName) {
+        Copy-Item -LiteralPath $file.FullName -Destination $clientPath -Force
+        $copied = $true
+        break
+    }
+}
+
+if (-not $copied) {
+    throw "PDCC client executable not found in downloaded archive."
+}
+
+if ($IsLinux) {
+    try {
+        chmod +x $clientPath | Out-Null
+    }
+    catch {
+    }
+}
+
+Write-Host "PDCC installed to $clientPath"

scripts/Prepare-PdccOut.ps1

@@ -0,0 +1,59 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$SourceDir,
+
+    [Parameter(Mandatory = $true)]
+    [string]$OutputDir,
+
+    [string]$PlatformKey = "",
+
+    [string[]]$InstallerFiles = @()
+)
+
+$ErrorActionPreference = "Stop"
+
+$SourceDir = [System.IO.Path]::GetFullPath($SourceDir)
+$OutputDir = [System.IO.Path]::GetFullPath($OutputDir)
+
+if (-not (Test-Path -LiteralPath $SourceDir)) {
+    throw "Source directory not found: $SourceDir"
+}
+
+if (Test-Path -LiteralPath $OutputDir) {
+    Remove-Item -LiteralPath $OutputDir -Recurse -Force
+}
+New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null
+
+$payloadRoot = if ([string]::IsNullOrWhiteSpace($PlatformKey)) {
+    $OutputDir
+} else {
+    Join-Path $OutputDir $PlatformKey
+}
+
+New-Item -ItemType Directory -Path $payloadRoot -Force | Out-Null
+Get-ChildItem -LiteralPath $SourceDir -Force | ForEach-Object {
+    Copy-Item -LiteralPath $_.FullName -Destination $payloadRoot -Recurse -Force
+}
+
+if ($InstallerFiles.Count -gt 0) {
+    $installerRoot = Join-Path $OutputDir "installers"
+    if (-not (Test-Path -LiteralPath $installerRoot)) {
+        New-Item -ItemType Directory -Path $installerRoot -Force | Out-Null
+    }
+
+    foreach ($installer in $InstallerFiles) {
+        if ([string]::IsNullOrWhiteSpace($installer)) {
+            continue
+        }
+
+        $installerPath = [System.IO.Path]::GetFullPath($installer)
+        if (-not (Test-Path -LiteralPath $installerPath)) {
+            throw "Installer file not found: $installerPath"
+        }
+
+        $targetPath = Join-Path $installerRoot ([System.IO.Path]::GetFileName($installerPath))
+        Copy-Item -LiteralPath $installerPath -Destination $targetPath -Force
+    }
+}
+
+Write-Host "Prepared PDCC staging directory: $payloadRoot"

scripts/Sign-FileMap.ps1

@@ -1,4 +1,4 @@
-param(
+param(
     [Parameter(Mandatory = $true)]
     [string]$FilesJsonPath,
 
@@ -11,46 +11,16 @@ param(
 
 $ErrorActionPreference = "Stop"
 
-if ($PSVersionTable.PSVersion.Major -lt 7) {
-    throw "Sign-FileMap.ps1 requires PowerShell 7 or newer."
-}
-
-if (-not (Test-Path -LiteralPath $FilesJsonPath)) {
-    throw "Manifest file not found: $FilesJsonPath"
-}
-
-if (-not (Test-Path -LiteralPath $PrivateKeyPath)) {
-    throw "Private key file not found: $PrivateKeyPath"
-}
-
 if ([string]::IsNullOrWhiteSpace($OutputPath)) {
     $OutputPath = "$FilesJsonPath.sig"
 }
 
-$resolvedManifestPath = (Resolve-Path -LiteralPath $FilesJsonPath).Path
+$toolProject = Join-Path $PSScriptRoot "..\PenguinLogisticsOnlineNetworkDistributionSystem\src\Plonds.Tool\Plonds.Tool.csproj"
-$manifestBytes = [System.IO.File]::ReadAllBytes($resolvedManifestPath)
+if (-not (Test-Path -LiteralPath $toolProject)) {
-
+    throw "PLONDS tool project not found: $toolProject"
-$privateKeyPem = Get-Content -LiteralPath $PrivateKeyPath -Raw
-if ([string]::IsNullOrWhiteSpace($privateKeyPem)) {
-    throw "Private key PEM is empty: $PrivateKeyPath"
 }
 
-$rsa = [System.Security.Cryptography.RSA]::Create()
+& dotnet run --project $toolProject -- sign --manifest $FilesJsonPath --private-key $PrivateKeyPath --output $OutputPath
-try {
+if ($LASTEXITCODE -ne 0) {
-    $rsa.ImportFromPem($privateKeyPem)
+    throw "PLONDS sign command failed."
-    $signatureBytes = $rsa.SignData(
-        $manifestBytes,
-        [System.Security.Cryptography.HashAlgorithmName]::SHA256,
-        [System.Security.Cryptography.RSASignaturePadding]::Pkcs1
-    )
 }
-finally {
-    $rsa.Dispose()
-}
-
-$signatureBase64 = [Convert]::ToBase64String($signatureBytes)
-[System.IO.File]::WriteAllText($OutputPath, $signatureBase64, [System.Text.Encoding]::ASCII)
-
-Write-Host "Signed manifest file."
-Write-Host "Manifest:  $FilesJsonPath"
-Write-Host "Signature: $OutputPath"

scripts/pdc-mock-server.py

@@ -0,0 +1,206 @@
+#!/usr/bin/env python3
+import argparse
+import json
+import re
+from datetime import datetime, timezone
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from pathlib import Path
+
+
+def _utc_now_text() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
+
+class PdcMockHandler(BaseHTTPRequestHandler):
+    protocol_version = "HTTP/1.1"
+    token = ""
+    data_dir = Path(".")
+
+    def _write_json(self, status_code: int, payload: dict) -> None:
+        body = json.dumps(payload, ensure_ascii=False).encode("utf-8")
+        self.send_response(status_code)
+        self.send_header("Content-Type", "application/json; charset=utf-8")
+        self.send_header("Content-Length", str(len(body)))
+        self.send_header("Connection", "close")
+        self.end_headers()
+        self.wfile.write(body)
+        self.wfile.flush()
+        self.close_connection = True
+
+    def handle_expect_100(self) -> bool:
+        self.send_response_only(100)
+        self.end_headers()
+        return True
+
+    def _read_chunked_body(self) -> bytes:
+        chunks = bytearray()
+        while True:
+            size_line = self.rfile.readline()
+            if not size_line:
+                break
+
+            size_line = size_line.strip()
+            if not size_line:
+                continue
+
+            size_text = size_line.split(b";", 1)[0]
+            chunk_size = int(size_text, 16)
+            if chunk_size == 0:
+                # Consume optional trailer headers until the terminating blank line.
+                while True:
+                    trailer = self.rfile.readline()
+                    if trailer in (b"", b"\r\n", b"\n"):
+                        break
+                break
+
+            remaining = chunk_size
+            while remaining > 0:
+                part = self.rfile.read(remaining)
+                if not part:
+                    raise ConnectionError("unexpected end of stream while reading chunked request body")
+                chunks.extend(part)
+                remaining -= len(part)
+
+            chunk_terminator = self.rfile.read(2)
+            if chunk_terminator == b"\r\n":
+                continue
+            if chunk_terminator[:1] != b"\n":
+                raise ValueError("invalid chunk terminator")
+
+        return bytes(chunks)
+
+    def _read_request_body(self) -> bytes:
+        transfer_encoding = (self.headers.get("Transfer-Encoding") or "").lower()
+        if "chunked" in transfer_encoding:
+            return self._read_chunked_body()
+
+        length = int(self.headers.get("Content-Length", "0"))
+        if length <= 0:
+            return b""
+        return self.rfile.read(length)
+
+    def _read_json_body(self) -> tuple[dict, bytes]:
+        raw = self._read_request_body()
+        if not raw:
+            return {}, raw
+        try:
+            return json.loads(raw.decode("utf-8")), raw
+        except Exception:
+            return {}, raw
+
+    def _save_payload(self, name: str, payload: dict, raw_body: bytes) -> None:
+        out = self.data_dir / f"{name}.json"
+        out.parent.mkdir(parents=True, exist_ok=True)
+        out.write_text(
+            json.dumps(
+                {
+                    "savedAtUtc": _utc_now_text(),
+                    "path": self.path,
+                    "method": self.command,
+                    "headers": {key: value for key, value in self.headers.items()},
+                    "rawBodyLength": len(raw_body),
+                    "rawBodyPreview": raw_body[:4096].decode("utf-8", errors="replace"),
+                    "payload": payload,
+                },
+                ensure_ascii=False,
+                indent=2,
+            ),
+            encoding="utf-8",
+        )
+
+    def _check_token(self) -> bool:
+        expected = (self.token or "").strip()
+        if not expected:
+            return True
+        provided = (self.headers.get("X-PDC-Token") or "").strip()
+        return provided == expected
+
+    def do_GET(self) -> None:
+        if self.path == "/healthz":
+            self._write_json(200, {"ok": True, "timeUtc": _utc_now_text()})
+            return
+
+        self._write_json(404, {"error": "not_found", "path": self.path})
+
+    def do_POST(self) -> None:
+        print(
+            f"[pdc-mock] {self.command} {self.path} "
+            f"content-length={self.headers.get('Content-Length', '')} "
+            f"transfer-encoding={self.headers.get('Transfer-Encoding', '')} "
+            f"expect={self.headers.get('Expect', '')}"
+        )
+
+        if not self._check_token():
+            self._write_json(401, {"error": "unauthorized"})
+            return
+
+        payload, raw_body = self._read_json_body()
+
+        if self.path == "/api/v1/fileMaps/diff":
+            items = payload.get("items") if isinstance(payload, dict) else {}
+            keys = sorted(items.keys()) if isinstance(items, dict) else []
+            self._save_payload("filemaps-diff-request", payload, raw_body)
+            # CI fallback mode: return empty diff to avoid long object uploads
+            # against a local mock endpoint. Real PDC endpoint will return
+            # actual missing object hashes.
+            result = {
+                "success": True,
+                "code": 0,
+                "message": "ok",
+                "content": [],
+                "Content": [],
+                "requestedCount": len(keys),
+            }
+            self._write_json(200, result)
+            return
+
+        if self.path == "/api/v1/fileMaps/upload":
+            self._save_payload("filemaps-upload-request", payload, raw_body)
+            result = {
+                "success": True,
+                "code": 0,
+                "message": "ok",
+                "content": True,
+                "Content": True,
+            }
+            self._write_json(200, result)
+            return
+
+        m = re.match(r"^/api/v1/distribution/([^/]+)/([^/]+)$", self.path)
+        if m:
+            primary_version = m.group(1)
+            version = m.group(2)
+            self._save_payload("distribution-request", payload, raw_body)
+            result = {
+                "success": True,
+                "code": 0,
+                "message": "ok",
+            }
+            self._write_json(200, result)
+            return
+
+        self._write_json(404, {"error": "not_found", "path": self.path})
+
+    def log_message(self, fmt: str, *args) -> None:
+        print(f"[pdc-mock] {self.address_string()} - {fmt % args}")
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="PDC mock server for CI fallback")
+    parser.add_argument("--host", default="127.0.0.1")
+    parser.add_argument("--port", type=int, default=18765)
+    parser.add_argument("--token", default="")
+    parser.add_argument("--data-dir", required=True)
+    args = parser.parse_args()
+
+    PdcMockHandler.token = args.token
+    PdcMockHandler.data_dir = Path(args.data_dir)
+    PdcMockHandler.data_dir.mkdir(parents=True, exist_ok=True)
+
+    server = ThreadingHTTPServer((args.host, args.port), PdcMockHandler)
+    print(f"[pdc-mock] listening on http://{args.host}:{args.port}")
+    server.serve_forever()
+
+
+if __name__ == "__main__":
+    main()