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A version check and a plugin update each read and rewrite the version manifest independently. If a delayed check finishes after an update, it can overwrite the new installed version with stale data. Two concurrent updates of the same plugin can also collide while swapping temporary directories.
This serializes version-manifest read/modify/write operations and shares one in-flight update promise per plugin. Deterministic regressions cover both interleavings with temporary plugin fixtures.
Validation: 38 plugin-manager tests, 660/660 full project tests, TypeScript typecheck, and
git diff --checkpass. No installed plugins or live app were changed.