debt(pre-router): resolved most of the technical debt that was noted while finishing epic-12 and epic-13.

core/events/src/main/kotlin/com/correx/core/events/stores/EventStore.kt

@@ -3,6 +3,7 @@ package com.correx.core.events.stores
 import com.correx.core.events.events.NewEvent
 import com.correx.core.events.events.StoredEvent
 import com.correx.core.events.types.SessionId
+import kotlinx.coroutines.flow.Flow
 
 
 interface EventStore {
@@ -34,4 +35,10 @@ interface EventStore {
      * Get last sequence number for session.
      */
     fun lastSequence(sessionId: SessionId): Long?
+
+    /**
+     * Subscribe to live events for a session. Emits each event as it is appended.
+     * Does not replay historical events — use [readFrom] for catch-up before subscribing.
+     */
+    fun subscribe(sessionId: SessionId): Flow<StoredEvent>
 }