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## Why Competing SQLite writers can cause database opening and writes to fail with `SQLITE_BUSY`. Deferred write transactions can also encounter contention after taking a read snapshot. ## What changed - Add up to two retries with 100 ms and 200 ms delays for SQLite busy errors during pool opening, writer admission, and standalone writes. - Use a shared `BEGIN IMMEDIATE` helper across state, thread history, and agent message board writes to acquire the writer slot before reading. - Preserve bound arguments when retrying standalone writes, and commit writes using `RETURNING` before exposing their results. Retry transaction admission without replaying an already-started transaction. ## Testing Add tests using real SQLite writer contention to verify recovery after a competing writer releases its lock. Queue tests cover enqueue, update, and delete, checking preserved payloads, single revision increments, and no duplicate messages or unintended deletions. GitOrigin-RevId: ac5bd31a87c67cc47fb385bf3fa5435a54ff70f0