feat: full pipeline fixes - CI status branch lookup, review webhook routing, auto-advance, plane sync

- handle_ci_status: fallback git branch -r --contains when branches[] empty
- webhook router: handle pull_request_approved event type
- handle_pr: map review.type to review.state for new Gitea format
- launcher: auto-advance stage after agent completion (_try_advance_stage)
- plane_sync: notify Plane on stage changes
- stages.py: stage machine with QG definitions
- notifications.py: stage change notifications
- safe.directory fix for container git operations

src/notifications.py

@@ -0,0 +1,28 @@
+"""Notifications and logging for orchestrator events."""
+
+import logging
+
+logger = logging.getLogger("orchestrator")
+
+
+def notify_stage_change(task_id: int, old_stage: str, new_stage: str, agent: str = None):
+    """Log stage transition."""
+    msg = f"Task {task_id}: {old_stage} → {new_stage}"
+    if agent:
+        msg += f" (launching {agent})"
+    logger.info(msg)
+
+
+def notify_qg_failure(task_id: int, stage: str, check: str, reason: str):
+    """Log QG check failure."""
+    logger.warning(f"Task {task_id}: QG failed at stage '{stage}', check={check}: {reason}")
+
+
+def notify_agent_finished(run_id: int, agent: str, exit_code: int):
+    """Log agent completion."""
+    logger.info(f"Agent run {run_id} ({agent}) finished with exit code {exit_code}")
+
+
+def notify_error(task_id: int, error: str):
+    """Log error for a task."""
+    logger.error(f"Task {task_id}: ERROR — {error}")