Add the licensed Joke Shop reference board

docs/joke-shop-map.md

@@ -79,6 +79,10 @@ just as with the Hollywood day/night rows.
 
 ## References
 
+The committed, license-cleared photo board for this block — with the provenance sidecar and the
+decisions each photo informed — is in
+[`screens/refs/joke-shop/README.md`](screens/refs/joke-shop/README.md).
+
 - OpenStreetMap way 428854155: <https://www.openstreetmap.org/way/428854155>
 - Wikimedia Commons photographs used for proportion and material study:
   - <https://commons.wikimedia.org/wiki/File:ComedyStore_01.jpg>