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.

app/Http/Controllers/ArtworkDownloadController.php

@@ -58,6 +58,16 @@ final class ArtworkDownloadController extends Controller
             abort(404);
         }
 
+        if (! File::isFile($filePath)) {
+            Log::warning('Artwork original file missing for download.', [
+                'artwork_id' => $artwork->id,
+                'ext' => $ext,
+                'resolved_path' => $filePath,
+            ]);
+
+            abort(404);
+        }
+
         $this->recordDownload($request, $artwork->id);
         $this->incrementDownloadCountIfAvailable($artwork->id);
 
@@ -70,16 +80,6 @@ final class ArtworkDownloadController extends Controller
             ]);
         }
 
-        if (! File::isFile($filePath)) {
-            Log::warning('Artwork original file missing for download.', [
-                'artwork_id' => $artwork->id,
-                'ext' => $ext,
-                'resolved_path' => $filePath,
-            ]);
-
-            abort(404);
-        }
-
         $downloadName = $this->buildDownloadFilename((string) $artwork->file_name, $ext);
 
         // X-Accel-Redirect is safe only when nginx is explicitly configured to