ci: Remove redundant prepublishOnly step from publish workflow

npm publish automatically runs prepublishOnly, making the explicit
step redundant. However, the Initialize step must be kept to ensure
Bun and dependencies are available for prepublishOnly execution.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: roottool

.github/workflows/publish.yml

@@ -55,9 +55,6 @@ jobs:
       - name: Initialize
         uses: ./.github/actions/setup-environment
 
-      - name: Run prepublishOnly
-        run: bun run prepublishOnly
-
       - name: Setup Node.js
         uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
         with: