fix: kill agent-spawned bash trees and dev servers on dashboard shutdown

TUI quit ('q'/Ctrl+C) bypassed signal handlers via process.exit(0), and
neither shutdown path closed the HTTP server, so server.close()'s
stopAllDevServers() listener never ran. In-flight agent bash commands
(spawned detached for their own pgroup) were also never aborted, so
their subprocess trees — including vitest workers — survived as orphans.

Route the TUI quit through SIGINT so the registered shutdown handler
runs, await stopAllDevServers() in both shutdown paths, and abort
in-flight bash on every active agent session at the start of the
runtime drain so killProcessTree reaches every grandchild.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/dashboard-tui/app.tsx

@@ -3555,11 +3555,15 @@ export function DashboardApp({ controller }: DashboardAppProps) {
 
   // Global key handling
   useInput((input, key) => {
-    // Quit
+    // Quit — route through SIGINT so the dashboard's shutdown handler runs
+    // (stops dev-server child process groups, engines, mesh, etc.). Calling
+    // process.exit(0) directly here orphans node/vitest children spawned by
+    // user-project dev servers.
     if (input === "q" || input === "Q" || (key.ctrl && input === "c")) {
       void controller.stop();
       exit();
-      process.exit(0);
+      process.kill(process.pid, "SIGINT");
+      return;
     }
 
     // View switching shortcuts — b/a/g enter interactive + set view

packages/cli/src/commands/dashboard.ts

@@ -23,6 +23,7 @@ import {
   createSkillsAdapter,
   getProjectSettingsPath,
   loadTlsCredentialsFromEnv,
+  stopAllDevServers,
   type RuntimeLogger,
 } from "@fusion/dashboard";
 import { aiMergeTask, MissionAutopilot, MissionExecutionLoop, HeartbeatMonitor, HeartbeatTriggerScheduler, type WakeContext, ProjectEngineManager, PeerExchangeService } from "@fusion/engine";
@@ -1434,6 +1435,16 @@ export async function runDashboard(port: number, opts: { paused?: boolean; dev?:
       dispose();
       stopDiagnosticInterval();
 
+      // Tear down user-project dev-server children (and their process groups)
+      // before exiting. server.close() is not awaited on this exit path, so
+      // its `close` listener that does the same cleanup may not run in time.
+      try {
+        await stopAllDevServers();
+      } catch (err) {
+        const message = err instanceof Error ? err.message : String(err);
+        logSink.warn(`Failed to stop dev servers: ${message}`, "dashboard");
+      }
+
       // Stop all project engines uniformly
       await engineManager.stopAll();
 
@@ -1658,6 +1669,15 @@ export async function runDashboard(port: number, opts: { paused?: boolean; dev?:
       if (triggerScheduler) triggerScheduler.stop();
       if (heartbeatMonitorImpl) heartbeatMonitorImpl.stop();
 
+      // Tear down user-project dev-server children (and their process groups)
+      // before exiting. process.exit below skips server.close()'s cleanup hook.
+      try {
+        await stopAllDevServers();
+      } catch (err) {
+        const message = err instanceof Error ? err.message : String(err);
+        logSink.warn(`Failed to stop dev servers: ${message}`, "dashboard");
+      }
+
       // Stop peer exchange service
       if (peerExchangeService) {
         try {