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

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

@@ -116,6 +116,33 @@ export class AgentSpawnerService implements OnModuleDestroy {
     return this.sessions.get(agentId);
   }
 
+  /**
+   * Find an active session by task ID.
+   */
+  findAgentSessionByTaskId(taskId: string): AgentSession | undefined {
+    return Array.from(this.sessions.values()).find((session) => session.taskId === taskId);
+  }
+
+  /**
+   * Update in-memory session state for visibility in list/status endpoints.
+   */
+  setSessionState(
+    agentId: string,
+    state: AgentSession["state"],
+    error?: string,
+    completedAt?: Date
+  ): void {
+    const session = this.sessions.get(agentId);
+    if (!session) return;
+
+    session.state = state;
+    session.error = error;
+    if (completedAt) {
+      session.completedAt = completedAt;
+    }
+    this.sessions.set(agentId, session);
+  }
+
   /**
    * List all agent sessions
    * @returns Array of all agent sessions