Checklist

release.yml produces signed FileMap incremental assets for Windows x64/x86 and Linux x64.
release.yml no longer depends on vpk/VeloPack packaging.
Launcher update engine applies only signed FileMap payload path.
Host update workflow no longer expects releases.win.json/*.nupkg.
Update source setting includes pdc and preserves GitHub fallback behavior.
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.