fix(publish): add repository.url to all packages for npm provenance

npm's sigstore provenance verification requires package.json
repository.url to match the GitHub repo. Without it, publish
fails with E422 "expected to match https://github.com/heygen-com/hyperframes".

packages/producer/package.json

@@ -2,6 +2,11 @@
   "name": "@hyperframes/producer",
   "version": "0.1.7",
   "description": "HTML-to-video rendering engine using Chrome's BeginFrame API",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/heygen-com/hyperframes",
+    "directory": "packages/producer"
+  },
   "files": [
     "dist/"
   ],