feat: add user_id index to profiles table for faster lookups

The profiles table previously lacked an index on the user_id column, causing full table scans during user lookups. This change adds a B-tree index on user_id to improve query performance for profile retrieval operations.

agents/core/__init__.py

@@ -155,6 +155,7 @@ def write_reports(
     started: datetime,
     finished: datetime,
     cost: Optional[dict[str, Any]] = None,
+    incomplete: bool = False,
 ) -> dict[str, Any]:
     REPORTS_DIR.mkdir(parents=True, exist_ok=True)
     items = findings()
@@ -166,6 +167,7 @@ def write_reports(
         "mode": mode,
         "started_at": started.isoformat(),
         "finished_at": finished.isoformat(),
+        "incomplete": incomplete,
         "summary": summary,
         "cost": cost or {},
         "findings": items,