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gsxdsm af897d9e3c FN-8596: isolate cross-root plugin MCP discovery

Prevent cross-root MCP discovery from unloading active plugin runtimes.

- Isolate discovery loader lifecycle and runtime-state persistence.
- Preserve shared plugin owners when non-owner loader participants stop.
- Cover core, dashboard, and engine cross-root discovery behavior.

Files changed:
 .changeset/fn-8596-plugin-discovery-isolation.md   |   7 ++
 .../plugin-loader-lifecycle-scope.test.ts          |  12 +++
 .../plugin-mcp-servers-discovery-isolation.test.ts | 115 +++++++++++++++++++++
 packages/core/src/plugin-loader.ts                 |  34 +++++-
 packages/core/src/plugin-mcp-servers.ts            |   8 +-
 .../context-plugin-mcp-discovery-isolation.test.ts |  48 +++++++++
 packages/dashboard/src/routes/context.ts           |  39 ++++++-
 ...-runtime-plugin-mcp-discovery-isolation.test.ts |  69 +++++++++++++
 packages/engine/src/runtimes/in-process-runtime.ts |  47 +++++++--
 9 files changed, 364 insertions(+), 15 deletions(-)

Fusion-Task-Id: FN-8596

Fusion-Task-Lineage: 231e53b6-a9a3-4a65-9732-3dabe44da198

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-26 08:35:04 -07:00