Add cancellation and cleanup for native server creation

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

@@ -1,5 +1,5 @@
 import { json } from '@sveltejs/kit';
-import { heartbeat } from '$lib/server/hosts/index.js';
+import { heartbeat, pendingCreationCancellations } from '$lib/server/hosts/index.js';
 import { authenticateAgent, hostApiError, objectBody } from '$lib/server/hosts/http.js';
 import { reconcileHostPreparation } from '$lib/server/hosts/preparation.js';
 export async function POST({ request }: { request: Request }) {
@@ -13,6 +13,6 @@ export async function POST({ request }: { request: Request }) {
             updateHostLibraryCaches(host.id, inventory.libraryCaches, { snapshot: true });
         }
         reconcileHostPreparation(host.id);
-        return json({ host, heartbeatSeconds: 15, serverTime: new Date().toISOString() });
+        return json({ host, cancelledCreations: pendingCreationCancellations(host.id), heartbeatSeconds: 15, serverTime: new Date().toISOString() });
     } catch (cause) { return hostApiError(cause); }
 }

src/routes/api/deployments/[id]/cancel/+server.ts

@@ -1,7 +1,14 @@
 import { json } from '@sveltejs/kit';
-import { cancelRemoval } from '$lib/server/provisioning/index.js';
+import { cancelRemoval } from '$lib/server/provisioning/history.js';
+import { cancelCreation } from '$lib/server/provisioning/cancel-creation.js';
+import { kickProvisioning } from '$lib/server/pipeline/worker.js';
 
 export function POST({ params }: { params: { id: string } }) {
-    if (!cancelRemoval(params.id)) return json({ error: 'Removal has already begun or this request is no longer waiting. Refresh to see its current state.' }, { status: 409 });
+    const cleanupId = cancelCreation(params.id);
+    if (cleanupId) {
+        void kickProvisioning();
+        return json({ ok: true, cleanupId });
+    }
+    if (!cancelRemoval(params.id)) return json({ error: 'This operation can no longer be cancelled. Refresh to see its current state.' }, { status: 409 });
     return json({ ok: true });
 }