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/commons_fetch.py

@@ -86,6 +86,20 @@ def search_titles(query: str, limit: int) -> list[str]:
     return titles, order
 
 
+def category_titles(category: str, limit: int) -> list[str]:
+    data = api_get(
+        {
+            "action": "query",
+            "list": "categorymembers",
+            "cmtitle": category,
+            "cmtype": "file",
+            "cmlimit": str(max(limit, 50)),
+        }
+    )
+    members = data.get("query", {}).get("categorymembers", [])
+    return [m["title"] for m in members][:limit]
+
+
 def image_info(titles: list[str], thumb_width: int) -> list[dict]:
     data = api_get(
         {
@@ -160,6 +174,7 @@ def download(url: str, path: str, retries: int = 3) -> str:
 def main() -> int:
     ap = argparse.ArgumentParser()
     ap.add_argument("--query", help="Commons search string")
+    ap.add_argument("--category", help='Commons category, e.g. "Category:Hollywood Masonic Temple"')
     ap.add_argument("--file", action="append", default=[], help="exact File: title, repeatable")
     ap.add_argument("--slug", required=True, help="output folder name under the out dir")
     ap.add_argument("--out", default="Art/reference", help="base output directory")
@@ -169,10 +184,14 @@ def main() -> int:
     ap.add_argument("--delay", type=float, default=2.0, help="seconds between downloads")
     args = ap.parse_args()
 
-    if not args.query and not args.file:
-        ap.error("need --query or --file")
+    if not args.query and not args.file and not args.category:
+        ap.error("need --query, --category, or --file")
 
     titles = list(args.file)
+    if args.category:
+        found = category_titles(args.category, args.limit * 4)
+        print(f"{len(found)} file(s) in {args.category}")
+        titles += [t for t in found if t not in titles]
     if args.query:
         found, _ = search_titles(args.query, args.limit * 3)
         titles += [t for t in found if t not in titles]
@@ -222,6 +241,7 @@ def main() -> int:
         "source": "Wikimedia Commons API",
         "api": API,
         "query": args.query,
+        "category": args.category,
         "requested_files": args.file,
         "slug": args.slug,
         "thumb_width": args.width,