feat(orchestrator): MS23-P0-005 subagent tree endpoint (#714)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/orchestrator/src/api/agents/agents-killswitch.controller.spec.ts

@@ -7,6 +7,7 @@ import { KillswitchService } from "../../killswitch/killswitch.service";
 import { AgentEventsService } from "./agent-events.service";
 import { AgentMessagesService } from "./agent-messages.service";
 import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
 import type { KillAllResult } from "../../killswitch/killswitch.service";
 
 describe("AgentsController - Killswitch Endpoints", () => {
@@ -41,6 +42,9 @@ describe("AgentsController - Killswitch Endpoints", () => {
     pauseAgent: ReturnType<typeof vi.fn>;
     resumeAgent: ReturnType<typeof vi.fn>;
   };
+  let mockTreeService: {
+    getTree: ReturnType<typeof vi.fn>;
+  };
 
   beforeEach(() => {
     mockKillswitchService = {
@@ -89,6 +93,10 @@ describe("AgentsController - Killswitch Endpoints", () => {
       resumeAgent: vi.fn().mockResolvedValue(undefined),
     };
 
+    mockTreeService = {
+      getTree: vi.fn().mockResolvedValue([]),
+    };
+
     controller = new AgentsController(
       mockQueueService as unknown as QueueService,
       mockSpawnerService as unknown as AgentSpawnerService,
@@ -96,7 +104,8 @@ describe("AgentsController - Killswitch Endpoints", () => {
       mockKillswitchService as unknown as KillswitchService,
       mockEventsService as unknown as AgentEventsService,
       mockMessagesService as unknown as AgentMessagesService,
-      mockControlService as unknown as AgentControlService
+      mockControlService as unknown as AgentControlService,
+      mockTreeService as unknown as AgentTreeService
     );
   });