test: cover the notify install gate

`_setup_hooks` installs the wait hook only for an interactive run: a one-shot
`plyngent "…"` never waits on a human, so `[notify]` must not arm a notifier
that could never fire. The test asserts the hook is cleared again when the run
is not interactive.

tests/test_cli/test_limits.py

@@ -99,6 +99,20 @@ def test_setup_hooks_installs_pty_hook_for_auto_continue(clean_auto_continue: No
     assert PtyManager._limit_continue is None
 
 
+def test_setup_hooks_installs_the_notifier_only_for_an_interactive_run(clean_auto_continue: None) -> None:
+    """A one-shot run never waits on a human, so it installs no wait hook."""
+    del clean_auto_continue
+    from plyngent.cli.app import _setup_hooks
+    from plyngent.config.models import NotifyConfig
+
+    _setup_hooks(interactive=False, auto_continue=False, notify=NotifyConfig())
+    assert get_prompt_wait_hook() is None
+    _setup_hooks(interactive=True, auto_continue=False, notify=NotifyConfig())
+    assert get_prompt_wait_hook() is not None
+    _setup_hooks(interactive=False, auto_continue=False, notify=NotifyConfig())
+    assert get_prompt_wait_hook() is None
+
+
 def test_pty_offer_raise_uses_auto_continue(clean_auto_continue: None) -> None:
     del clean_auto_continue
     PtyManager.set_limit_continue_hook(prompt_continue_limit)