Change the host store to allow prefix RRI keys

packages/host/app/services/render-service.ts

@@ -136,13 +136,19 @@ export class CardStoreWithErrors implements CardStore {
   }
 
   private normalizeKey(id: string): string {
-    return this.normalizeURL(id).replace(/\.json$/, '');
+    let key = id.replace(/\.json$/, '');
+    // Cache keys fold to the canonical spelling (prefix form where a realm
+    // mapping exists) so prefix-form and URL-form lookups share an entry,
+    // matching the host store's keying.
+    return isLocalId(key)
+      ? key
+      : this.#virtualNetwork.unresolveURL(this.#virtualNetwork.toURL(key).href);
   }
 
   private normalizeURL(id: string): string {
     let key = id.replace(/\.json$/, '');
-    // Local IDs pass through; remote IDs canonicalize to URL form via the
-    // VN so prefix-form and URL-form lookups share a cache key.
+    // Load targets resolve to the real URL — this is the fetch boundary, and
+    // the loaded document's id is stamped from it.
     return isLocalId(key) ? id : this.#virtualNetwork.toURL(id).href;
   }
 

packages/host/app/services/store.ts

@@ -2875,12 +2875,13 @@ export function asURL(
     return urlOrDoc.data.id;
   }
   let id = urlOrDoc.replace(/\.json$/, '');
-  // Locals stay as-is; remotes resolve through the VN to a normalized URL.
-  // Keying stays in URL form so it matches gc-card-store, which keys instances
-  // by their (URL-form) data.id. Flipping the store's canonical key to RRI is
-  // deferred — it needs gc-card-store keyed the same way and the URL
-  // normalization `toURL` provides here (see CS-11730).
-  return isLocalId(id) ? id : vn.toURL(id).href;
+  // Locals stay as-is; remotes fold to the canonical spelling — through the
+  // VN's URL parse first (normalizing slashes/encoding the way a served URL
+  // is spelled), then back to prefix form where a realm mapping exists. This
+  // matches the document branch above, which returns `data.id` verbatim and
+  // is canonical (prefix form for mapped realms) as served, so both branches
+  // key a mapped realm's instance identically.
+  return isLocalId(id) ? id : vn.unresolveURL(vn.toURL(id).href);
 }
 
 function isSystemCardDefaultId(