chore: update Q1 scripts with minor fixes

seed/improve_question_variety_q1.py

@@ -13,8 +13,6 @@ Room schema and identity hash are untouched. build_db.py is NOT run.
 from __future__ import annotations
 
 import json
-import os
-import re
 import sqlite3
 from collections import defaultdict
 from pathlib import Path
@@ -279,7 +277,12 @@ def rewrite_template_overflow(files: dict[Path, dict[str, Any]]) -> dict[str, st
                     by_stem[stem].append(q)
                     break
 
-    taken = {normalize_text(q["text"]) for data in files.values() for q in data.get("questions", []) if q.get("text")}
+    taken = {
+        normalize_text(q["text"])
+        for data in files.values()
+        for q in data.get("questions", [])
+        if q.get("text")
+    }
 
     for stem, rows in by_stem.items():
         rows = sorted(rows, key=lambda item: item["id"])

seed/validate_question_variety.py

@@ -13,7 +13,6 @@ from __future__ import annotations
 
 import argparse
 import json
-import os
 import re
 import sqlite3
 import sys