partly or unimplemented features - now implemented

docs/modules/prov-cache/architecture.md

@@ -112,6 +112,17 @@ When policy bundles change:
                                             WHERE policy_hash = ?
 ```
 
+### Invalidation DI Wiring and Lifecycle
+
+`AddProvcacheInvalidators()` registers the event-driven invalidation pipeline in dependency injection:
+
+- Creates `IEventStream<SignerRevokedEvent>` using `IEventStreamFactory.Create<T>(new EventStreamOptions { StreamName = SignerRevokedEvent.StreamName })`
+- Creates `IEventStream<FeedEpochAdvancedEvent>` using `IEventStreamFactory.Create<T>(new EventStreamOptions { StreamName = FeedEpochAdvancedEvent.StreamName })`
+- Registers `SignerSetInvalidator` and `FeedEpochInvalidator` as singleton `IProvcacheInvalidator` implementations
+- Registers `InvalidatorHostedService` as `IHostedService` to own invalidator startup/shutdown
+
+`InvalidatorHostedService` starts all registered invalidators during host startup and stops them in reverse order during host shutdown. Each invalidator subscribes from `StreamPosition.End`, so only new events are consumed after process start.
+
 ### Invalidation Recording
 
 All invalidation events are recorded in the revocation ledger for audit and replay: