docs: list the reference fetcher in Tools/README

Tools/README.md

@@ -10,9 +10,12 @@ Repeatable import/export and processing helpers. Anything that was done twice by
 - No credentials, no absolute machine paths, no writes outside the project by default.
 - A script that produces game content logs what it produced, so `Game/Content` can be audited against it.
 
-## Planned helpers
+## Helpers
 
-- `check-lfs.sh` — repository guard (exists): fails if `git-lfs` or the `lfs` filter is missing, or if an LFS-tracked file was committed as a plain blob
+- `check-lfs.sh` — repository guard: fails if `git-lfs` or the `lfs` filter is missing, or if an LFS-tracked file was committed as a plain blob.
+- `commons_fetch.py` — Wikimedia Commons reference fetcher. Search or exact `File:` titles, 1600 px thumbnails, provenance `sidecar.json` per folder. Writes only into the gitignored `Art/reference/`; reference images are never committed.
+
+## Planned helpers
 - Blender export preset runner (named presets, metric scale assertion)
 - Blender→Unreal scale test (export a known-size cube, verify 100× conversion)
 - OSM extract fetch and manifest writer (records date, bounds, checksum)