* fix: MCP server crashes under parallel tool calls (#326)
* fix: ensure full connection pool is pre-created to avoid race conditions during query execution
* fix: improve graceful shutdown handling with exit codes
* fix: resolve critical concurrency bugs in connection pool init
- Add initPromises dedup map to prevent double-init race when parallel
tool calls trigger initLbug for the same repoId simultaneously
- Move pool.set() after FTS load so concurrent checkout can't grab a
connection mid-async-init (FTS race on available[0])
- Replace lazy createConnection growth path with integrity error — pool
is pre-warmed, lazy creation would silence stdout during active queries
- Add preWarmActive flag so watchdog timer skips stdout restore during
the synchronous pre-warm loop
- Unify stdout capture: server.ts imports realStdoutWrite from
lbug-adapter instead of capturing its own copy
* test: add connection pool parallel stability tests
7 integration tests covering concurrent query safety, waiter queue
overflow, stdout.write restoration, connection leak detection, initLbug
deduplication, atomic pool visibility, and mixed query types.
* fix: run LadybugDB tests sequentially via vitest projects config
Vitest's projects feature splits test files into two groups: lbug-db
(fileParallelism: false) and default (parallel). This prevents native
mmap file-lock conflicts on Windows without requiring the CI shell loop
locally.
* test: add enrichment Promise.all regression test for #292/#316
Verifies that 3 concurrent queries via Promise.all (the exact pattern
from the impact command's enrichment phase at local-backend.ts:1415)
complete without SIGSEGV on a pre-warmed connection pool.
