Remove unused `pathlib.Path` and `RegistryNotFoundError` from resolver.py and unused `tempfile` from test_routing_core.py, resolving ruff F401 errors. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Remove unused `pathlib.Path` and `RegistryNotFoundError` from resolver.py and unused `tempfile` from test_routing_core.py, resolving ruff F401 errors. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>