feat(jobs): ingest.blob worker (content-addressed)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/jobs/index.js

@@ -1,8 +1,9 @@
 import * as queue from './queue.js';
 import * as echo from './workers/echo.js';
 import * as url from './workers/url.js';
+import * as blob from './workers/blob.js';
 
-const WORKERS = [echo, url];
+const WORKERS = [echo, url, blob];
 
 export async function registerWorkers() {
   for (const w of WORKERS) {