feat(platform): Phase 1 — Durable Event Bus + Worker Runtime
- New module: event-subscriptions/ (types, repository, routes, 15 tests)
- Subscription CRUD: create/list/get/update/delete event subscriptions
- DLQ: list/retry/delete/purge dead-letter queue entries
- Event replay: POST /events/replay by topic + time range
- New lib: event-dispatcher.ts — subscription-driven dispatch with retry + DLQ
- New lib: event-store-bridge.ts — persistent event log for replay capability
- Worker runtime hardening (jobs/runner.ts):
- Concurrency limit (MAX_CONCURRENT_JOBS=5)
- Stuck-job recovery (10min threshold)
- Graceful shutdown (30s drain)
- Active job tracking + diagnostics (getActiveJobs/getActiveJobCount)
- Per-job dedup (skip if already running)
- Wired dispatcher + event-subscriptions into server.ts startup
- Cosmos containers: event_subscriptions, event_dlq, event_log
- 1,293 tests passing (15 new)
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