fix: resolve pylint/pyright issues in new test files

- test_contrib_gitea_client: remove unused Any import, fix _mock_response
  to use return_value instead of lambda (unknown lambda type), narrow
  HTTPError hdrs type, add type annotations to fake_urlopen helpers,
  suppress protected-access for _request tests
- test_bootstrap: annotate **kw as **kw: object, use dict literal,
  unpack server_address via index to avoid tuple type mismatch
- test_main: remove unused MagicMock import
- test_watchdog: guard store.get() result before accessing .status

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/orchestrator/test_watchdog.py

@@ -71,7 +71,9 @@ class WatchdogSweepTest(unittest.TestCase):
             self.wd.start()
             time.sleep(0.05)  # enough for several iterations at 0.01s tick
             self.wd.stop()
-        self.assertEqual(STATUS_FROZEN, self.store.get("o", "r", 5).status)
+        rec = self.store.get("o", "r", 5)
+        assert rec is not None
+        self.assertEqual(STATUS_FROZEN, rec.status)
 
 
 if __name__ == "__main__":