fix(build): auto-stamp changelog version from release manifest (#1179)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/release-pr.yml

@@ -16,11 +16,17 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Read version from manifest
+        id: version
+        run: |
+          VERSION=$(jq -r '."packages/core"' .github/release-please/.release-please-manifest.json)
+          echo "tag=@videojs/core@${VERSION}" >> "$GITHUB_OUTPUT"
+
       - name: Update root changelog
         uses: orhun/git-cliff-action@v4
         with:
           config: cliff.toml
-          args: --verbose
+          args: --verbose --tag ${{ steps.version.outputs.tag }}
         env:
           OUTPUT: CHANGELOG.md
           GITHUB_REPO: ${{ github.repository }}