refs: pull the Commons categories for the Masonic Temple and El Capitan

A text search had stopped surfacing new material, so commons_fetch.py gained
--category. Category:Hollywood Masonic Temple and Category:El Capitan Theater
yielded 32 more frames locally, including 4-5k px frontal façades, a 2019
street-level shot of both buildings together, the 1922 postcard, and the first
oblique evidence for the 6806-6822 retail run. 68 local images total, none
committed. A clean sidewalk-level frame of the hero entry is still absent.

Tools/README.md

@@ -17,7 +17,7 @@ Repeatable import/export and processing helpers. Anything that was done twice by
 - `street_mesh.py` — road, kerbs, and sidewalks on the DEM, in the project frame; kerbs flush at the three crossings.
 - `terrain_from_dem.py` — terrain grid from the committed DEM, with building footprints cut out.
 - `blosm_blockout.py` — headless Blosm import of the committed `.osm` extract into a `.blend`, with a per-building scale report. Exact invocation in `Art/blender/README.md`.
-- `commons_fetch.py` — Wikimedia Commons reference fetcher. Search or exact `File:` titles, thumbnails, provenance `sidecar.json` per folder. Wikimedia throttles `upload.wikimedia.org` (HTTP 429), so keep batches to six or fewer files and pass `--delay 3`; a throttled file is skipped and recorded rather than aborting the run. Writes only into the gitignored `Art/reference/`; reference images are never committed.
+- `commons_fetch.py` — Wikimedia Commons reference fetcher. Search, exact `File:` titles, or a whole Commons category (`--category`), thumbnails, provenance `sidecar.json` per folder. Wikimedia throttles `upload.wikimedia.org` (HTTP 429), so keep batches to six or fewer files and pass `--delay 3`; a throttled file is skipped and recorded rather than aborting the run. Writes only into the gitignored `Art/reference/`; reference images are never committed.
 
 ## Planned helpers
 - Blender export preset runner (named presets, metric scale assertion)