chore: import upstream snapshot with attribution

utils/text.py

@@ -0,0 +1,14 @@
+import re
+
+
+def safe_path_component(name) -> str:
+    """Sanitize an LLM-derived identifier for use as a filesystem path component.
+
+    Identifiers come from model output over user-supplied story text, so they may
+    contain separators or traversal sequences; keep word characters (including
+    CJK), dashes, dots and spaces, replace everything else, and strip leading
+    dots so the result can never escape or hide within the working directory.
+    """
+    cleaned = re.sub(r"[^\w\-. ]", "_", str(name))
+    cleaned = cleaned.strip().lstrip(".")
+    return cleaned or "unnamed"