Ship production optimization M1-M12.5A: queues, metrics, HTTP observability, and vector search reliability.

Keep similar-ai from tripping the global circuit on a lone URL 502, clamp Qdrant search to 100, and add Server-Timing plus slow-request logging. Studio shared props, Academy S3 exists caching, heat chunking, and Redis/scheduler hygiene stay in this rollout.

tests/Feature/Collections/CollectionDispatchGateTest.php

@@ -0,0 +1,18 @@
+<?php
+
+use App\Models\Collection;
+use App\Services\CollectionBackgroundJobService;
+use Illuminate\Support\Facades\Queue;
+
+it('does not dispatch collection jobs when the producer gate is off', function () {
+    config(['collections.v5.queue.dispatch_enabled' => false]);
+    Queue::fake();
+
+    $collection = Collection::factory()->create();
+    $result = app(CollectionBackgroundJobService::class)->dispatchHealthRefresh($collection);
+
+    expect($result['status'])->toBe('disabled')
+        ->and($result['count'])->toBe(0);
+
+    Queue::assertNothingPushed();
+});