Cache Plutonium runtime files on hosts

src/routes/api/agent/heartbeat/+server.ts

@@ -1,5 +1,5 @@
 import { json } from '@sveltejs/kit';
-import { heartbeat, pendingCreationCancellations } from '$lib/server/hosts/index.js';
+import { heartbeat, pendingCreationCancellations, shouldDeferPlutoniumPreparation } from '$lib/server/hosts/index.js';
 import { authenticateAgent, hostApiError, objectBody } from '$lib/server/hosts/http.js';
 import { reconcileHostPreparation } from '$lib/server/hosts/preparation.js';
 import { reconcileHostLibraryCleanup } from '$lib/server/game-files/index.js';
@@ -17,6 +17,7 @@ export async function POST({ request }: { request: Request }) {
         reconcileHostPreparation(host.id);
         reconcileHostLibraryCleanup(host.id);
         return json({ host, cancelledCreations: pendingCreationCancellations(host.id), heartbeatSeconds: 15,
+            deferPlutoniumPreparation: shouldDeferPlutoniumPreparation(host.id),
             observationKeepDays: fleetSettings().observationKeepDays, serverTime: new Date().toISOString() });
     } catch (cause) { return hostApiError(cause); }
 }