docs: add review demo recording

.codex-plugin/plugin.json

@@ -65,7 +65,8 @@
             }
           ]
         },
-        "commerce": false
+        "commerce": false,
+        "demo_recording_url": "https://raw.githubusercontent.com/callstackincubator/codex-mobile-dev-plugin/main/docs/review/media/mobile-dev-demo.mp4"
       },
       "publication": {
         "release_notes": "Adds product-specific privacy, terms and support links, three starter prompts, and reproducible review cases. Corrects TraceSift write/service annotations. Filters storage secrets and binary values before host delivery, scopes reads before decoding, and adds exact key/column selection."

docs/review/README.md

@@ -62,8 +62,7 @@ service. No Mobile Dev account or test credentials are required.
 
 ## Demo recording
 
-Set `extensions.com.openai.review.demo_recording_url` to the reviewer-accessible
-HTTPS recording URL, then run:
+Validate the submission metadata with:
 
 ```sh
 npm run check:marketplace-review -- --ready