feat: integrate Analyst into Plane/Orchestrator pipeline

- Add git fetch+checkout in agent launch cmd (ensures correct branch)
- Add git fetch+checkout in _monitor_agent before commit/push
- Post start comment in Plane when analyst launches
- Post :approved: request comment after analyst completes successfully
- Branch lookup moved before cmd construction for reuse

src/webhooks/plane.py

@@ -130,6 +130,9 @@ async def handle_work_item_created(data: dict):
             task_desc = f"Work item: {work_item_id}\nRepo: {repo}\nBranch: {branch}\nStage: analysis\nTitle: {name}"
             run_id = launcher.launch("analyst", repo, task_desc, task_id=task_id)
             logger.info(f"Task {task_id}: launched analyst (run_id={run_id})")
+            # Post start comment to Plane
+            from ..plane_sync import add_comment as _add_comment
+            _add_comment(work_item_id, "🔍 Analyst запущен. BRD/ТЗ/AC/TestPlan в работе (ожидайте 8-15 мин).")
     except Exception as e:
         logger.error(f"Failed to launch analyst for {work_item_id}: {e}")