feat(scouts): debug scripts + deliver_pending diagnostic logs

- scripts/trigger_gmail_scout.py: manually fire ScoutEngine.trigger_scout
- scripts/inspect_gmail_scout_token.py: decrypt + show stored OAuth scopes
- scripts/show_gmail_scout_state.py: print scout config + queue/log counts
- scripts/reset_triage_queue_to_queued.py: revert delivered → queued for re-delivery
- engine.py: info logs around deliver_pending (rows found, send_json roundtrip)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/reset_triage_queue_to_queued.py

@@ -0,0 +1,35 @@
+"""Re-queue all delivered (but not acked) triage rows so deliver_pending sends them again.
+
+Usage:
+    python scripts/reset_triage_queue_to_queued.py
+"""
+
+from __future__ import annotations
+
+import asyncio
+import sys
+from pathlib import Path
+
+_API_ROOT = Path(__file__).resolve().parent.parent
+if str(_API_ROOT) not in sys.path:
+    sys.path.insert(0, str(_API_ROOT))
+
+from sqlalchemy import update
+
+from app.db import async_session
+from app.models import ScoutTriageQueue
+
+
+async def main() -> None:
+    async with async_session() as session:
+        result = await session.execute(
+            update(ScoutTriageQueue)
+            .where(ScoutTriageQueue.status == "delivered")
+            .values(status="queued", delivered_at=None)
+        )
+        await session.commit()
+        print(f"Reset {result.rowcount} rows from delivered → queued")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())