Joseph Doherty 55a05914d0 feat: add SiteStreamGrpcServer with Channel<T> bridge and stream limits ...

- Define ISiteStreamSubscriber interface for decoupling from SiteRuntime
- Implement SiteStreamGrpcServer (inherits SiteStreamServiceBase) with:
  - Readiness gate (SetReady)
  - Max concurrent stream enforcement
  - Duplicate correlationId replacement (cancels previous stream)
  - StreamRelayActor creation per subscription
  - Bounded Channel<SiteStreamEvent> bridge (1000 capacity, drop-oldest)
  - Clean teardown: unsubscribe, stop actor, remove tracking entry
- Identity-safe cleanup using ConcurrentDictionary.TryRemove(KeyValuePair)
  to prevent replacement streams from being removed by predecessor cleanup
- 7 unit tests covering reject-not-ready, max-streams, duplicate cancel,
  cleanup-on-cancel, subscribe/remove lifecycle, event forwarding

2026-03-21 11:52:31 -04:00

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