Reconcile host preparation on heartbeats instead of polls

src/lib/server/hosts/preparation.ts

@@ -173,7 +173,7 @@ function supersedeUndeliveredDownloads(hostId: string): void {
     }
 }
 
-/** Agent heartbeats and polls drive durable preparation; no open UI or in-memory worker is needed. */
+/** Heartbeats drive durable preparation; idle checks do not reserve the SQLite writer. */
 export function reconcileHostPreparation(hostId: string): HostPreparation {
     return db().transaction(() => {
         const host = getHost(hostId);
@@ -203,5 +203,5 @@ export function reconcileHostPreparation(hostId: string): HostPreparation {
             scheduleAvailabilityRefresh();
         }
         return status;
-    }).immediate();
+    })();
 }

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

@@ -1,10 +1,8 @@
 import { pendingHostOperationRows, waitForHostWork } from '$lib/server/hosts/index.js';
 import { authenticateAgent } from '$lib/server/hosts/http.js';
-import { reconcileHostPreparation } from '$lib/server/hosts/preparation.js';
 import { hostOperationsResponse } from '$lib/server/hosts/delivery.js';
 export async function GET({ request }: { request: Request }) {
     const host = authenticateAgent(request);
-    reconcileHostPreparation(host.id);
     const params = new URL(request.url).searchParams;
     const lane = params.get('lane') === 'health' ? 'health' : params.get('lane') === 'read' ? 'read' : params.get('lane') === 'write' ? 'write' : 'all';
     let operations = pendingHostOperationRows(host.id, lane, false);