fix(headless): send terminal notification when loop exits without stopAuto

Headless mode waits for 'Assisted/Autonomous mode stopped' to detect
completion.  When the loop exits via natural break (e.g. step-wizard
in /next), stopAuto() is never called, so headless hangs forever.

- Add s.stopAutoCalled flag to AutoSession
- Set flag in stopAuto(), clear in cleanupAfterLoopExit()
- Send terminal notification from cleanupAfterLoopExit() only when
  stopAuto() was bypassed
- Fixes sf headless next hanging after unit completes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/resources/extensions/sf/auto.js

@@ -741,6 +741,16 @@ function cleanupAfterLoopExit(ctx) {
 	clearUnitTimeout();
 	restoreProjectRootEnv();
 	restoreMilestoneLockEnv();
+	// ── Headless terminal notification ──
+	// When the loop exits naturally (e.g. step-wizard break) stopAuto() is
+	// never called, so the "Autonomous/Assisted mode stopped" notification
+	// that headless.ts waits for is never emitted.  Send it here only when
+	// stopAuto() was bypassed so headless mode can detect completion.
+	if (!s.stopAutoCalled && ctx) {
+		const label = s.stepMode ? "Assisted mode stopped" : "Autonomous mode stopped";
+		ctx.ui.notify(label, "info", { kind: "terminal", source: "workflow" });
+	}
+	s.stopAutoCalled = false;
 	// Clear crash lock and release session lock so the next `/next` does
 	// not see a stale lock with the current PID and treat it as a "remote"
 	// session (which would cause it to SIGTERM itself). (#2730)
@@ -780,6 +790,7 @@ function cleanupAfterLoopExit(ctx) {
 }
 export async function stopAuto(ctx, pi, reason) {
 	if (!s.active && !s.paused) return;
+	s.stopAutoCalled = true;
 	_unregisterCtrlCInterceptor();
 	const loadedPreferences = loadEffectiveSFPreferences()?.preferences;
 	const reasonSuffix = reason ? ` — ${reason}` : "";

src/resources/extensions/sf/auto/session.js

@@ -137,6 +137,11 @@ export class AutoSession {
 	activeEngineId = null;
 	activeRunDir = null;
 	cmdCtx = null;
+	/**
+	 * Set to true by stopAuto() so cleanupAfterLoopExit() can avoid sending
+	 * a duplicate terminal notification in headless mode.
+	 */
+	stopAutoCalled = false;
 	/**
 	 * Last known ExtensionCommandContext that had newSession().
 	 *
@@ -361,6 +366,7 @@ export class AutoSession {
 		this.paused = false;
 		this.stepMode = false;
 		this.canAskUser = true;
+		this.stopAutoCalled = false;
 		this.verbose = false;
 		this.activeEngineId = null;
 		this.activeRunDir = null;