perf: lazy load authenticated office peers

src/main.ts

@@ -1180,6 +1180,11 @@ async function enterOffice() {
     if (!built || !city) return;
     const { createOfficeScene, createOfficeMinimap, pack, materials } = built;
     const depth = access.can.officeDepth;
+    // Keep the remote-avatar renderer behind the authenticated boundary. The
+    // public Office door can build its full local scene without downloading it.
+    const createOfficePeers = access.subject !== null
+      ? (await import("./realtime/scenePeers.ts")).createScenePeers
+      : null;
 
     /**
      * The building's own sky, built before the scene because the scene wants the
@@ -1252,7 +1257,7 @@ async function enterOffice() {
       ...(depth === "full"
         ? { onPresencePick: (p) => showDetail(p ? p.label : null) }
         : { onPlacePick: (place) => showDetail(place ? place.label : null) }),
-      ...(access.subject !== null ? { realtimePeers: {} } : {}),
+      ...(createOfficePeers ? { realtimePeers: { create: createOfficePeers } } : {}),
     });
     office.onViewChange(() => renderLegend());
     officePlan = buildOfficePlan(createOfficeMinimap, office);