feat(orchestrator): add SSE events, queue controls, and mosaic rails sync

apps/orchestrator/src/spawner/agent-lifecycle.service.ts

@@ -37,6 +37,24 @@ export class AgentLifecycleService {
     this.logger.log("AgentLifecycleService initialized");
   }
 
+  /**
+   * Register a newly spawned agent in persistent state and emit spawned event.
+   */
+  async registerSpawnedAgent(agentId: string, taskId: string): Promise<AgentState> {
+    await this.valkeyService.createAgent(agentId, taskId);
+    const createdState = await this.getAgentState(agentId);
+
+    const event: AgentEvent = {
+      type: "agent.spawned",
+      agentId,
+      taskId,
+      timestamp: new Date().toISOString(),
+    };
+    await this.valkeyService.publishEvent(event);
+
+    return createdState;
+  }
+
   /**
    * Acquire a per-agent mutex to serialize state transitions.
    * Uses promise chaining: each caller chains onto the previous lock,