docs: require annotated tags for framework releases

RELEASE.md

@@ -61,6 +61,8 @@ Use [semantic versioning](https://semver.org/): `MAJOR.MINOR.PATCH`
 
 ## Release Checklist
 
+**Tagging policy:** Framework releases MUST use **annotated tags** (`git tag -a`), not lightweight tags.
+
 ### 1. Decide Version Number
 
 ```bash
@@ -251,7 +253,7 @@ git checkout main
 
 **Caution:** Review each branch carefully for conflicts or branch-specific issues.
 
-### 9. Create Git Tag
+### 9. Create Annotated Git Tag
 
 ```bash
 # Tag the main branch
@@ -269,6 +271,8 @@ See CHANGELOG.md for full details."
 git push origin v${NEW_VER}
 ```
 
+Do not use lightweight tags (`git tag v${NEW_VER}`) for framework releases.
+
 ### 10. Create GitHub Release
 
 1. Go to: https://github.com/YOUR_ORG/universal_dependencies/releases/new
@@ -475,7 +479,7 @@ git push origin v2.1.1
 4. **Communicate Clearly:** Explain impact to users
 5. **Batch Branches:** Update all UD branches together for consistency
 6. **Keep Changelog:** Maintain detailed CHANGELOG.md
-7. **Tag Consistently:** Use `v{MAJOR}.{MINOR}.{PATCH}` format
+7. **Tag Consistently:** Use `v{MAJOR}.{MINOR}.{PATCH}` as annotated tags (`git tag -a`)
 
 ## Troubleshooting