chore(gitea-sync): record first status-driven Gitea sync

- buglog: gitea_issue / gitea_synced_status for the 20 bugs created and the
  30 already-synced entries (#25/#35 reopened as partial)
- .kiro/specs/*/spec.json: "gitea" milestone/issue mapping for all 66 specs
  (65 milestones + 195 issues created, 158 closed at creation)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.kiro/specs/worker-join-refactor/spec.json

@@ -18,5 +18,13 @@
       "approved": true
     }
   },
-  "ready_for_implementation": true
+  "ready_for_implementation": true,
+  "gitea": {
+    "milestone_id": 60,
+    "issues": {
+      "requirements_design": 243,
+      "implementation": 244,
+      "validation": 245
+    }
+  }
 }