refactor(tests): remove dead code and unused xfail

why: Clean up test code by removing unused/impossible code paths.
what:
- Remove unused xfail_reason from pane_title_changed (test uses
  pytest.skip() before xfail can trigger)
- Remove dead assertion block in test_options.py that contradicted
  the preceding assert (lines 445-456)

Author: tony

tests/test_hooks.py

@@ -415,7 +415,6 @@ class HookTestCase(t.NamedTuple):
         "pane_title_changed",
         "pane-title-changed",
         "3.5",
-        xfail_reason="pane-title-changed requires tmux 3.5+",
     ),
     # NOTE: client-light-theme and client-dark-theme are not in any released tmux
     # version yet (will be in 3.6+). Add them back when 3.6 is released.

tests/test_options.py

@@ -442,19 +442,6 @@ def test_show_option_pane_fixture(
 
     assert result == expected
 
-    if expected is None:
-        assert result is not None, (
-            f"Expected {expected} to be {type(expected)}, got None"
-        )
-
-    if isinstance(expected, dict):
-        assert isinstance(result, dict), f'Expected dict, got "{type(result)}"'
-
-        for k, v in expected.items():
-            assert k in result
-
-            assert result[k] == v
-
 
 def test_stable_baseline_options_and_hooks(server: Server) -> None:
     """Ensure stable baseline across tmux versions."""