fix: address P0-4 chat zombie, P0-5 double SessionStarted, P0-6 steering wrong content

core/events/src/main/kotlin/com/correx/core/events/events/SessionEvents.kt

@@ -38,3 +38,9 @@ data class SessionFailedEvent(
     val errorCode: String? = null,
     val errorMessage: String? = null
 ) : EventPayload
+
+@Serializable
+@SerialName("ChatSessionStarted")
+data class ChatSessionStartedEvent(
+    val sessionId: SessionId,
+) : EventPayload

core/events/src/main/kotlin/com/correx/core/events/orchestration/OrchestrationStatus.kt

@@ -2,6 +2,7 @@ package com.correx.core.events.orchestration
 
 enum class OrchestrationStatus {
     IDLE,
+    CHAT,
     RUNNING,
     PAUSED,
     COMPLETED,

core/events/src/main/kotlin/com/correx/core/events/serialization/Serialization.kt

@@ -30,6 +30,7 @@ import com.correx.core.events.events.RetryAttemptedEvent
 import com.correx.core.events.events.RiskAssessedEvent
 import com.correx.core.events.events.SessionCompletedEvent
 import com.correx.core.events.events.SessionFailedEvent
+import com.correx.core.events.events.ChatSessionStartedEvent
 import com.correx.core.events.events.SessionPausedEvent
 import com.correx.core.events.events.SessionResumedEvent
 import com.correx.core.events.events.SessionStartedEvent
@@ -101,6 +102,7 @@ val eventModule = SerializersModule {
         subclass(WorkflowCompletedEvent::class)
         subclass(RetryAttemptedEvent::class)
         subclass(RiskAssessedEvent::class)
+        subclass(ChatSessionStartedEvent::class)
     }
 }