Merge pull request '发布切换等待正在准备的原图下载' (#30) from codex/download-release-drain-20261104 into main

lib/storage/image-download-preparation.ts

@@ -89,6 +89,6 @@ export function scheduleImageDownloadPreparation(id?: string) {
           worker.scanPending = false;
         }
       }
-    }, { durable: true });
+    });
   });
 }

tests/routes/canvas-download-recovery.test.ts

@@ -112,10 +112,11 @@ test("the preparation deadline cancels the source body as well as its headers",
 test("requested downloads are prioritized with two workers before scanning background assets", async () => {
   let active = 0; let maximum = 0; let scans = 0;
   const releases: Array<() => void> = [];
+  const workRecords: Array<{ active: number; durable: number }> = [];
   const claimed: string[] = []; const saved: string[] = [];
   const bytes = Buffer.from("compatible PNG fixture");
   const worker = serverLoader({
-    "@/lib/observability/active-work": { trackRuntimeWork: (execute: () => Promise<void>) => execute() },
+    "node:fs": { writeFileSync: (_path: string, value: string) => workRecords.push(JSON.parse(value)), unlinkSync() {} },
     "./image-archive-db": {
       claimImageDownloadTask: async (id: string) => { claimed.push(id); return { id, targetUrl: `https://cdn.example/${id}.png`, metadata: {} }; },
       saveImageDownloadAsset: async (id: string) => saved.push(id),
@@ -127,6 +128,7 @@ test("requested downloads are prioritized with two workers before scanning backg
   })("lib/storage/image-download-preparation.ts");
   worker.scheduleImageDownloadPreparation("one"); worker.scheduleImageDownloadPreparation("two"); worker.scheduleImageDownloadPreparation("three");
   await expect.poll(() => active).toBe(2);
+  expect(workRecords.at(-1)).toMatchObject({ active: 1, durable: 0 });
   expect(scans).toBe(0);
   releases.splice(0).forEach(release => release());
   await expect.poll(() => claimed.length).toBe(3);