chore: add untracked crumbs file

scripts/untracked.py

@@ -0,0 +1,16 @@
+import os
+import subprocess
+import sys
+
+cmd = ["git", "ls-files", "--others", "--exclude-standard"]
+result = subprocess.Popen(
+    cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True
+)
+with open(".gitignore", "r") as f:
+    ignored = [line.rstrip() for line in f]
+
+untracked = [os.path.basename(line.rstrip()) for line in result.stdout]
+for file in untracked:
+    if not any(file in item for item in ignored):
+        print(f"File '{file}' is untracked")
+        sys.exit(1)