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_watchdog.py

@@ -2,7 +2,9 @@
 
 from __future__ import annotations
 
+import time
 import unittest
+import unittest.mock
 from datetime import datetime, timedelta
 
 from bot_bottle.orchestrator.model import STATUS_FROZEN, STATUS_RUNNING, RunRecord
@@ -61,6 +63,16 @@ class WatchdogSweepTest(unittest.TestCase):
         self.wd.start()
         self.wd.stop()
 
+    def test_loop_sweeps_stale_record(self):
+        # Patch tick to near-zero so the loop iterates quickly.
+        stale = (_NOW - timedelta(hours=1)).isoformat()
+        self.store.upsert(_record(5, STATUS_RUNNING, stale))
+        with unittest.mock.patch("bot_bottle.orchestrator.watchdog._TICK_SECS", 0.01):
+            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)
+
 
 if __name__ == "__main__":
     unittest.main()