fix(mcp): serialize ADR access across processes#892
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Use a cache-local advisory lock so independent MCP and CLI processes sharing CBM_CACHE_DIR cannot rebuild the same project DB concurrently. Serialize manage_adr reads and writes with rebuilds, reopen stale file-backed stores before ADR access, and 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 rebuilds, and reopen stale file-backed stores before ADR accessEnvironment observed
CBM_CACHE_DIRRepro covered by tests
try_lockreport busymanage_adr(update)cannot write while another process owns the rebuild lockVerification
git diff --check./build/c/test-runner pipeline(218 passed)./build/c/test-runner mcp(141 passed)scripts/build.sh --version 0.8.1-adrfix.20260705d CC=clang CXX=clang++