fix(tests): skip pty/termios tests on non-unix systems

Added pytest.importorskip calls for 'pty' and 'termios' modules in
test_ai_tui_agent_harness.py to fix test failures on Windows where
these modules are unavailable.

Co-authored-by: PR0M3TH3AN <[email protected]>

src/tests/test_ai_tui_agent_harness.py

@@ -6,6 +6,9 @@ import sys
 
 import pytest
 
+pytest.importorskip("pty")
+pytest.importorskip("termios")
+
 
 def _load_harness_module():
     repo_root = Path(__file__).resolve().parents[2]