fix(coding-agent): kill tracked detached bash children on shutdown

packages/coding-agent/src/utils/shell.ts

@@ -172,6 +172,27 @@ export function sanitizeBinaryOutput(str: string): string {
 		.join("");
 }
 
+/**
+ * Detached child processes must be tracked so they can be killed on parent
+ * shutdown signals (SIGHUP/SIGTERM).
+ */
+const trackedDetachedChildPids = new Set<number>();
+
+export function trackDetachedChildPid(pid: number): void {
+	trackedDetachedChildPids.add(pid);
+}
+
+export function untrackDetachedChildPid(pid: number): void {
+	trackedDetachedChildPids.delete(pid);
+}
+
+export function killTrackedDetachedChildren(): void {
+	for (const pid of trackedDetachedChildPids) {
+		killProcessTree(pid);
+	}
+	trackedDetachedChildPids.clear();
+}
+
 /**
  * Kill a process and all its children (cross-platform)
  */