Fix RegFree manifest-file race under parallel MSBuild#988

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fix-regfree-manifest-race

Commits on Jul 7, 2026

Fix RegFree manifest-file race under parallel MSBuild

johnml1135
and
claude
committed
Add comment heuristic to AGENTS.md; trim RegFree comments to match

johnml1135
and
claude
committed
Catch AbandonedMutexException around the manifest-lock WaitOne()

johnml1135
and
claude
committed