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

core/kernel/src/main/kotlin/com/correx/core/kernel/orchestration/DefaultOrchestrationReducer.kt

@@ -1,5 +1,6 @@
 package com.correx.core.kernel.orchestration
 
+import com.correx.core.events.events.ChatSessionStartedEvent
 import com.correx.core.events.events.OrchestrationPausedEvent
 import com.correx.core.events.events.OrchestrationResumedEvent
 import com.correx.core.events.events.RetryAttemptedEvent
@@ -16,6 +17,12 @@ class DefaultOrchestrationReducer : OrchestrationReducer {
         state: OrchestrationState,
         event: StoredEvent,
     ): OrchestrationState = when (val p = event.payload) {
+        is ChatSessionStartedEvent -> state.copy(
+            workflowId = "chat",
+            status = OrchestrationStatus.CHAT,
+            currentStageId = null,
+        )
+
         is WorkflowStartedEvent -> state.copy(
             workflowId = p.workflowId,
             status = OrchestrationStatus.RUNNING,