docs: record the second reference pass and its gaps

Five usable sets added locally (hero daytime façades, the El Capitan Theatre
block, night premiere staging, Ovation Hollywood, and the Lee Drug neighbour) —
41 images total, none committed. Records what remains missing: a sidewalk-level
frame of the hero entry, the 6806-6822 retail run, and a night frame of 6840
itself rather than its neighbour.

commons_fetch.py now survives a throttled download instead of discarding the
rest of the batch, and takes --delay.

Tools/commons_fetch.py

@@ -166,6 +166,7 @@ def main() -> int:
     ap.add_argument("--limit", type=int, default=6)
     ap.add_argument("--width", type=int, default=1600, help="thumbnail width in px")
     ap.add_argument("--dry-run", action="store_true")
+    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:
@@ -199,7 +200,13 @@ def main() -> int:
         name = safe_name(item["title"], index)
         path = os.path.join(out_dir, name)
         print(f"  [{index}/{len(selected)}] {item['title']}")
-        digest = download(item["download_url"], path)
+        try:
+            digest = download(item["download_url"], path)
+        except SystemExit as exc:
+            # one throttled file must not discard the ones already fetched
+            print(f"    skipped: {exc}", flush=True)
+            time.sleep(args.delay * 5)
+            continue
         item.update(
             {
                 "local_file": name,
@@ -208,7 +215,7 @@ def main() -> int:
             }
         )
         records.append(item)
-        time.sleep(1)
+        time.sleep(args.delay)
 
     sidecar = {
         "fetched_utc": datetime.datetime.now(datetime.timezone.utc).isoformat(timespec="seconds"),