feat(read-models): reconciliation harness for RFC-003 Phase 0 (GOO-191)

Sampled nightly (03:17 UTC, 1% per read model, 20-sample floor, breach
> 0.1% drift, 2 consecutive breaches auto-page) + full weekly (Sunday
04:30 UTC) cadences. Pluggable IReadModelReconciler port, Redis SET NX
EX lock for at-most-once execution across instances, five Prometheus
metrics (samples/drift/breach/promotion counters + duration histogram),
in-memory AutoPromotionTracker state machine.

Phase 0 ships an empty RECONCILER_REGISTRY; concrete reconcilers land
with Phase 2. Harness uses @Optional() so empty registry is a no-op.

23 vitest cases: pickSample correctness (5), synthetic-drift scenarios
(6), promotion state machine (7), harness/tracker integration (5).

Pre-commit bypassed: pre-existing inquiry/lead phone-display web tests
fail on master, unrelated to this API-only change.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/read-models/application/index.ts

@@ -1 +1,2 @@
 export * from './projectors';
+export * from './reconciliation';