ci: use CHANGELOG.md for GitHub Release notes

Extract the current version's section from CHANGELOG.md and use it
as the GitHub Release body instead of auto-generated PR title lists.
Falls back to auto-generated notes if no CHANGELOG entry is found.

This makes CHANGELOG.md the single source of truth for release notes —
written and reviewed during the release PR, automatically picked up
by the publish workflow. No more manual post-release editing.

Made-with: Cursor

.github/workflows/publish.yml

@@ -63,7 +63,24 @@ jobs:
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
+      - name: Extract release notes from CHANGELOG
+        id: changelog
+        shell: bash
+        run: |
+          VERSION="${GITHUB_REF#refs/tags/v}"
+          # Extract everything between ## [VERSION] and the next ## [
+          NOTES=$(awk "/^## \\[$VERSION\\]/{found=1; next} /^## \\[/{if(found) exit} found" gitnexus/CHANGELOG.md)
+          if [ -z "$NOTES" ]; then
+            echo "::warning::No CHANGELOG entry found for v$VERSION, falling back to auto-generated notes"
+            echo "fallback=true" >> "$GITHUB_OUTPUT"
+          else
+            # Write to file (handles multi-line content safely)
+            echo "$NOTES" > /tmp/release-notes.md
+            echo "fallback=false" >> "$GITHUB_OUTPUT"
+          fi
+
       - name: Create GitHub Release
         uses: softprops/action-gh-release@a06a81a03ee405af7f2048a818ed3f03bbf83c7b # v2
         with:
-          generate_release_notes: true
+          body_path: ${{ steps.changelog.outputs.fallback == 'false' && '/tmp/release-notes.md' || '' }}
+          generate_release_notes: ${{ steps.changelog.outputs.fallback == 'true' }}