Fix container resource sampling and surface collection failures

src/lib/hosts.ts

@@ -69,6 +69,7 @@ export interface HostInventory {
     capabilities?: string[];
     agentUpdate?: HostAgentUpdate;
     instanceResources?: InstanceResources[];
+    instanceResourcesError?: string;
 }
 export interface InstanceResources {
     instanceId: string; generation: number; uptimeSeconds: number; cpuCores: number; memoryBytes: number;

src/lib/server/hosts/calibration.ts

@@ -15,6 +15,8 @@ interface AllowanceRow {
 function database() { const handle = db(); ensureHostSchema(handle); return handle; }
 
 export function validateInstanceResources(inventory: HostInventory): void {
+    if (inventory.instanceResourcesError !== undefined && (typeof inventory.instanceResourcesError !== 'string'
+        || inventory.instanceResourcesError.length > 500)) throw new Error('Invalid instance resource sampling error.');
     const samples = inventory.instanceResources;
     if (samples === undefined) return;
     if (!Array.isArray(samples) || samples.length > 1000) throw new Error('Invalid instance resource samples.');