feat(db): auto-close picked-up tickets on sprint stop

sprint stop now marks in_progress/review tickets as done
automatically — agents often forget to update status after merging.
Backlog/ready tickets are left as carry-over candidates since they
were never started.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

db/connectors/sprint

@@ -358,7 +358,25 @@ def cmd_stop(args):
     cancelled = [t for t in tickets if t["status"] == "cancelled"]
     incomplete = [t for t in tickets if t["status"] not in ("done", "cancelled")]
 
-    # Complete
+    # Auto-close: mark picked-up tickets (in_progress, review) as done.
+    # Work merged to main before sprint close means the ticket is done —
+    # agents just forget to update status. Backlog/ready tickets were
+    # never started, so they stay as carry-over candidates.
+    picked_up_statuses = ("in_progress", "review")
+    picked_up = [t for t in incomplete if t["status"] in picked_up_statuses]
+    auto_closed = []
+    if picked_up:
+        conn = get_connection()
+        for t in picked_up:
+            conn.execute("UPDATE tickets SET status='done' WHERE id=?", (t["id"],))
+            auto_closed.append(t)
+        conn.commit()
+        conn.close()
+        # Move auto-closed into done count, remove from incomplete
+        done = done + auto_closed
+        incomplete = [t for t in incomplete if t["status"] not in picked_up_statuses]
+
+    # Complete the sprint
     conn = get_connection()
     conn.execute(
         "UPDATE sprints SET status='completed', end_date=date('now') WHERE id=?",
@@ -372,10 +390,14 @@ def cmd_stop(args):
     print(f"Done: {len(done)}/{len(tickets)}")
     if cancelled:
         print(f"Cancelled: {len(cancelled)}")
+    if auto_closed:
+        print(f"Auto-closed: {len(auto_closed)} tickets marked done on sprint close:")
+        for t in auto_closed:
+            print(f"  #{t['id']}: {t['title']} ({t['status']} → done)")
     print()
 
     if incomplete:
-        print("Carry-over candidates (incomplete):")
+        print("Carry-over candidates (never started):")
         format_ticket_table(incomplete)
         print()