Fix CI lint job failures from Ruff rule violations

achievements.py

@@ -1,7 +1,6 @@
 from datetime import datetime, timezone
 from typing import Dict, List, Optional
 
-
 ACHIEVEMENTS = [
     {"id": "first_solve", "title": "First Solve", "description": "Solve your first puzzle."},
     {"id": "solve_5", "title": "Solver: 5", "description": "Solve 5 puzzles."},
@@ -44,20 +43,28 @@ def evaluate_achievements(state: Dict, levels: Optional[List[Dict]] = None) -> L
     for aid, cond in thresholds:
         if cond and aid not in unlocked:
             meta = _ach_by_id(aid) or {"id": aid}
-            unlocked[aid] = {"unlocked_at": _now_iso(), "title": meta.get("title"), "description": meta.get("description")}
+            unlocked[aid] = {
+                "unlocked_at": _now_iso(),
+                "title": meta.get("title"),
+                "description": meta.get("description"),
+            }
             newly.append({"id": aid, **unlocked[aid]})
 
     # category completion achievements if levels provided
     if levels:
         # build category -> set(ids)
         cats = {}
-        for l in levels:
-            cid = l.get("category") or "uncategorized"
-            cats.setdefault(cid, set()).add(l.get("id"))
+        for level in levels:
+            cid = level.get("category") or "uncategorized"
+            cats.setdefault(cid, set()).add(level.get("id"))
         for cat, ids in cats.items():
             if ids and ids.issubset(solved) and f"category_{cat}" not in unlocked:
                 aid = f"category_{cat}"
-                unlocked[aid] = {"unlocked_at": _now_iso(), "title": f"Master: {cat}", "description": f"Solve all puzzles in {cat}."}
+                unlocked[aid] = {
+                    "unlocked_at": _now_iso(),
+                    "title": f"Master: {cat}",
+                    "description": f"Solve all puzzles in {cat}.",
+                }
                 newly.append({"id": aid, **unlocked[aid]})
 
     return newly