fix(dev): stop max listeners exceeded warning messages when running more than 10 runs concurrently (#2771)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Centralizes SIGTERM handling in `DevSupervisor` and removes per-run
SIGTERM listeners in `DevRunController` to avoid
MaxListenersExceededWarning under high concurrency.
> 
> - **Dev runtime**:
> - **SIGTERM handling**: Add centralized handler in
`packages/cli-v3/src/dev/devSupervisor.ts` to gracefully stop all run
controllers; unregisters on `shutdown()`.
> - **Cleanup**: Remove per-controller `SIGTERM` listener and handler
from `packages/cli-v3/src/entryPoints/dev-run-controller.ts` to reduce
event listeners and warnings.
> - **Changeset**: Add patch note in
`.changeset/fuzzy-ghosts-admire.md`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
5ad2f53. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: ericallam

.changeset/fuzzy-ghosts-admire.md

@@ -0,0 +1,5 @@
+---
+"trigger.dev": patch
+---
+
+fix(dev): stop max listeners exceeded warning messages when running more than 10 runs concurrently

packages/cli-v3/src/dev/devSupervisor.ts

@@ -138,11 +138,26 @@ class DevSupervisor implements WorkerRuntime {
     //start an SSE connection for presence
     this.disconnectPresence = await this.#startPresenceConnection();
 
+    // Handle SIGTERM to gracefully stop all run controllers
+    process.on("SIGTERM", this.#handleSigterm);
+
     //start dequeuing
     await this.#dequeueRuns();
   }
 
+  #handleSigterm = async () => {
+    logger.debug("[DevSupervisor] Received SIGTERM, stopping all run controllers");
+
+    const stopPromises = Array.from(this.runControllers.values()).map((controller) =>
+      controller.stop()
+    );
+
+    await Promise.allSettled(stopPromises);
+  };
+
   async shutdown(): Promise<void> {
+    process.off("SIGTERM", this.#handleSigterm);
+
     this.disconnectPresence?.();
     try {
       this.socket?.close();

packages/cli-v3/src/entryPoints/dev-run-controller.ts

@@ -122,14 +122,8 @@ export class DevRunController {
         logger.debug("[DevRunController] Failed to poll for snapshot", { error });
       },
     });
-
-    process.on("SIGTERM", this.sigterm.bind(this));
   }
 
-  private async sigterm() {
-    logger.debug("[DevRunController] Received SIGTERM, stopping worker");
-    await this.stop();
-  }
 
   // This should only be used when we're already executing a run. Attempt number changes are not allowed.
   private updateRunPhase(run: Run, snapshot: Snapshot) {
@@ -856,8 +850,6 @@ export class DevRunController {
   async stop() {
     logger.debug("[DevRunController] Shutting down");
 
-    process.off("SIGTERM", this.sigterm);
-
     if (this.taskRunProcess && !this.taskRunProcess.isBeingKilled) {
       try {
         const version = this.opts.worker.serverWorker?.version || "unknown";