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.module.ts

@@ -9,6 +9,7 @@ import { AgentEventsService } from "./agent-events.service";
 import { PrismaModule } from "../../prisma/prisma.module";
 import { AgentMessagesService } from "./agent-messages.service";
 import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
 
 @Module({
   imports: [QueueModule, SpawnerModule, KillswitchModule, ValkeyModule, PrismaModule],
@@ -18,6 +19,7 @@ import { AgentControlService } from "./agent-control.service";
     AgentEventsService,
     AgentMessagesService,
     AgentControlService,
+    AgentTreeService,
   ],
 })
 export class AgentsModule {}