chore: import upstream snapshot with attribution

dev/normalize_chars.py

@@ -0,0 +1,43 @@
+import sys
+from pathlib import Path
+
+# Mapping of characters to normalize. Start with quotes; extend as needed.
+CHAR_MAP = {
+    "\u2018": "'",  # left single quotation mark
+    "\u2019": "'",  # right single quotation mark
+    "\u201c": '"',  # left double quotation mark
+    "\u201d": '"',  # right double quotation mark
+}
+
+
+def fix_file(path: Path) -> bool:
+    try:
+        text = path.read_text(encoding="utf-8")
+    except UnicodeDecodeError:
+        # Non-UTF8 (likely binary) — skip
+        return False
+
+    new_text = text
+    for bad, good in CHAR_MAP.items():
+        new_text = new_text.replace(bad, good)
+
+    if new_text != text:
+        path.write_text(new_text, encoding="utf-8")
+        return True
+    return False
+
+
+def main(argv: list[str]) -> int:
+    changed = 0
+    for arg in argv:
+        p = Path(arg)
+        if p.is_file():
+            if fix_file(p):
+                changed += 1
+    if changed:
+        print(f"Normalized characters in {changed} file(s).")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv[1:]))