fix: allow workflow to continue if changelog automation fails

Add continue-on-error to Claude changelog step so the release PR is
still created even if the changelog automation fails.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ashwin-ant

.github/workflows/publish.yml

@@ -129,6 +129,7 @@ jobs:
         git commit -m "chore: bump version to ${{ env.VERSION }}"
 
     - name: Update changelog with Claude
+      continue-on-error: true
       uses: anthropics/claude-code-action@v1
       with:
         prompt: |