docs: clarify release verification scope

README.md

@@ -54,7 +54,7 @@ python tools/download_impact.py --include sample --output downloads
 python tools/verify_release.py downloads/v1.1/sample/IMPACT-v1.1-sample.zip
 ```
 
-Use `python tools/download_impact.py --list` to inspect all bundle keys. Exact byte sizes and SHA-256 checksums are published in `v1.1/MANIFEST.tsv` and `v1.1/SHA256SUMS`.
+Use `python tools/download_impact.py --list` to inspect all bundle keys. Exact byte sizes, SHA-256 checksums, and verification scope are published in `v1.1/MANIFEST.tsv`, `v1.1/SHA256SUMS`, and `v1.1/VERIFICATION.tsv`.
 
 ## Data Structure