Implement Phase 3 PostgreSQL queue API

[evantahler]

Implements docs/plans/03-queue.md.

• adds the node-resque-compatible Queue inspection and administration surface backed by pg-boss jobs
• adds delayed duplicate protection, failure management, worker metadata accessors, string-valued stats, and leader lookup
• recreates queues after delQueue and only drops a pg-boss queue when no jobs remain
• forceCleanWorker fails one original active job in place
• ports all Phase 3 Queue titles, including worker metadata cleanup/retry behavior
• adds focused count/range, expiry, multi-instance duplicate, serialization, and error-path coverage
• introduces the plugin base/runner needed by enqueue hooks
• updates the living phase plans and conformance semantic-difference log
• bumps the package to 0.2.0

Verification:

• bun test __tests__/core/queue.test.ts --max-concurrency=1 — 56 pass, 0 skip
• bun run lint
• bun run build
• node scripts/assert-node-package.mjs

  

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 480fe14. Configure here.}