fix(mcp): serialize ADR access across processes#892
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Use project-scoped cache-local advisory locks so independent MCP and CLI processes sharing CBM_CACHE_DIR cannot rebuild the same project DB concurrently without blocking unrelated project indexes. Serialize manage_adr reads and writes with same-project rebuilds, reopen stale file-backed stores before ADR access, and avoid watcher self-locking when a supervised worker performs the reindex. Cover the cross-process lock behavior with fork-based regression tests. Signed-off-by: SS-42 <noreply@incogni.to>
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Summary
CBM_CACHE_DIRmanage_adrreads, writes, and legacy migration with same-project rebuilds, and reopen stale file-backed stores before ADR accessEnvironment observed
CBM_CACHE_DIRRepro covered by tests
try_lockreport busy for the same projectmanage_adr(update)cannot write while another process owns the same-project rebuild lockVerification
git diff --checkASAN_OPTIONS=detect_leaks=0 build/c/test-runner pipeline mcp(360 passed)scripts/test.sh CC=clang CXX=clang++(5920 passed, 1 skipped; watchdog regressions passed; security allow-list passed)scripts/build.sh --version 0.8.1-adrfix.20260706a CC=clang CXX=clang++