test: add coverage for orchestrator + gitea client (diff gate 77% → 98%)

Three new unit test modules:
- tests/unit/test_contrib_gitea_client.py — GiteaClient (urllib mocked)
  and GiteaForge delegation
- tests/unit/orchestrator/test_main.py — __main__ run/status commands
- tests/unit/orchestrator/test_bootstrap.py — _token, BotBottleStateStore,
  _to_forge_state/_to_record, make_forge, make_sidecar, build

Augments to existing suites:
- test_events: non-"created" comment action ignored
- test_lifecycle: _iso_now callable, untracked-issue comment ignored,
  untracked-PR closed ignored (covers _find_by_pr return-None path)
- test_runner: destroy command, _default_run via subprocess mock
- test_sidecar: _jsonable dataclass/list branches, OpLog.read on missing
  file, drain_done_events on corrupted file, socket _Handler invalid-JSON
  and empty-line paths, serve() with pre-existing socket path
- test_watchdog: _loop body covered by patching _TICK_SECS to 0.01s
- test_webhook: unknown GET path returns 404

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

tests/unit/orchestrator/test_runner.py

@@ -60,6 +60,22 @@ class SubprocessRunnerTest(unittest.TestCase):
             ["/py", "/x/cli.py", "resume", "slug-1", "--headless", "--prompt",
              "address review"], self.argvs[0])
 
+    def test_destroy_calls_cleanup(self):
+        code = self.runner.destroy("slug-7")
+        self.assertEqual(0, code)
+        self.assertEqual(["/py", "/x/cli.py", "cleanup", "slug-7"], self.argvs[0])
+
+
+class DefaultRunTest(unittest.TestCase):
+    def test_calls_subprocess_and_returns_code(self):
+        from unittest.mock import MagicMock, patch
+        from bot_bottle.orchestrator.runner import _default_run
+        with patch("subprocess.run") as mock_run:
+            mock_run.return_value = MagicMock(returncode=42)
+            code = _default_run(["echo", "hi"], {"PATH": "/bin"})
+        self.assertEqual(42, code)
+        mock_run.assert_called_once_with(["echo", "hi"], env={"PATH": "/bin"}, check=False)
+
 
 if __name__ == "__main__":
     unittest.main()