Adds PrReconciler — a per-repo, self-owned polling loop (started from the
runtime layer in project-engine.ts, NOT the scheduler) that ETag-probes
GitHub, deep-fetches on change, persists mirror state, clears unverified
on first reconcile, and fires releaseHeldTaskByEvent(github:pr-<event>)
for transitions (changes-requested/approved/conflict/conflict-cleared/
merged/closed). Drops terminal entities; persists an audit event on error.
GitHub ops injected via PrReconcileGithubOps at the 3 CLI sites; engine
never imports the dashboard client. scheduler.ts stays PR-free (R20),
pinned by a regression test. 8 tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
c13f9a123b