```

refactor: reset message IDs on new turn and add activity log handlers

- Reset assistant message and thought IDs when starting new agent turn
- Add comprehensive activity log handlers in session context
- Handle tool calls, results, and errors with proper state updates
- Add transcription and assistant chunk streaming handlers
- Improve audio playback with proper error handling and confirmation
- Use generateMessageId() for consistent ID generation
- Filter out transcription activity logs from chat
- Stop audio playback when real speech is detected
```

packages/server/src/server/acp/agent-manager.ts

@@ -268,6 +268,10 @@ export class AgentManager {
       throw new Error(`Agent ${agentId} is ${agent.status}`);
     }
 
+    // Reset message IDs for new turn - ensures each prompt gets fresh responses
+    agent.currentAssistantMessageId = null;
+    agent.currentThoughtId = null;
+
     // Set session mode if specified
     if (options?.sessionMode) {
       await this.setSessionMode(agentId, options.sessionMode);