fix: correct NPM publish workflow directory and error handling

- Change to claude-dev-toolkit directory before publishing
- Remove continue-on-error to properly report failures
- Fixes ENOENT package.json error in GitHub Actions
- Ensures workflow fails appropriately when NPM publish fails

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: PaulDuvall

.github/workflows/npm-publish-simple.yml

@@ -30,5 +30,6 @@ jobs:
           echo "::add-mask::${{ inputs.npm_token }}"
       
       - name: Publish
-        run: npm publish --access public
-        continue-on-error: true  # Don't fail if package doesn't exist
+        run: |
+          cd claude-dev-toolkit
+          npm publish --access public