ci: add check_tag_problems.py

Makefile

@@ -43,6 +43,7 @@ endef
 
 lint:
 	poetry run python scripts/sort_tags.py
+	poetry run python scripts/check_tag_problems.py
 	poetry sort
 	npx prettier --write "**/*.{ts,tsx,css,json,yaml,yml,md}"
 	$(call lint_target,.)

scripts/check_tag_problems.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+import sys
+from pathlib import Path
+
+import json5
+
+
+def main():
+    # Load tags file
+    tags_file = Path("leetcode_py/cli/resources/leetcode/json/tags.json5")
+    problems_dir = Path("leetcode_py/cli/resources/leetcode/json/problems")
+
+    with open(tags_file) as f:
+        tags_data = json5.load(f)
+
+    # Get all existing problem JSON files
+    existing_problems = {p.stem for p in problems_dir.glob("*.json")}
+
+    # Check each tag's problems
+    missing_problems = []
+    for tag_name, problems in tags_data.items():
+        if isinstance(problems, list):
+            for problem in problems:
+                if isinstance(problem, str):  # Skip dict entries like {"tag": "grind-75"}
+                    if problem not in existing_problems:
+                        missing_problems.append((tag_name, problem))
+
+    if missing_problems:
+        print("❌ Found problems in tags that don't have JSON files:")
+        for tag_name, problem in missing_problems:
+            print(f"  {tag_name}: {problem}")
+        sys.exit(1)
+    else:
+        print("✅ All tagged problems have corresponding JSON files!")
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()