fix: add ASK_USER_QUESTION to statusline-setup agent, clear debounce on command change

- Agent can now ask for clarification when PS1 is not found
- Clear pending debounce timer before immediate doUpdate on command
  change to prevent redundant second execution

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/ui/hooks/useStatusLine.ts

@@ -240,6 +240,11 @@ export function useStatusLine(): {
   useEffect(() => {
     if (!hasMountedRef.current) return;
     if (statusLineCommand) {
+      // Clear any pending debounce so we don't get a redundant second run.
+      if (debounceTimerRef.current !== undefined) {
+        clearTimeout(debounceTimerRef.current);
+        debounceTimerRef.current = undefined;
+      }
       doUpdate();
     }
     // Cleanup when command is removed is handled by the state-change effect.