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docs/ECOSYSTEM_BOUNDARIES.md

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+# Ecosystem Boundaries
+
+This document defines ownership boundaries for the LanMountainDesktop plugin ecosystem.
+
+## Source of Truth
+
+- Host runtime and plugin loading: `LanMountainDesktop`
+- Plugin SDK API baseline: `LanMountainDesktop`
+- Shared contracts used by host and plugins: `LanMountainDesktop`
+- Plugin market index and ecosystem metadata: `LanAirApp`
+- Official sample plugin implementation and release artifacts: `LanMountainDesktop.SamplePlugin`
+
+## What Stays in This Repository
+
+- Host runtime code and desktop shell behavior
+- Plugin runtime, loader, install coordination, and host integration
+- Plugin SDK public interfaces, contracts, and registration helpers
+- Host appearance and settings infrastructure
+- Tests that validate host + SDK behavior
+
+## What Should Not Be Maintained Here as Authoritative
+
+- Market documentation as a canonical developer portal
+- Market publishing metadata as canonical source
+- Official sample plugin source and release pipeline
+- External reference projects (for example ClassIsland) as dependencies
+
+## Local Debugging Rule
+
+When running a workspace build, plugin market index and related market assets must be resolved from the sibling repository path:
+
+- `..\\LanAirApp\\airappmarket\\index.json`
+
+The host should not depend on an embedded `LanAirApp` mirror inside this repository for workspace market resolution.