chore: remove failing npm publish workflow

Publishing handled manually via /publish-version command.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/publish.yml

@@ -1,30 +0,0 @@
-name: Publish to npm
-
-on:
-  push:
-    tags:
-      - 'v*'
-
-jobs:
-  publish:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          registry-url: 'https://registry.npmjs.org'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Build
-        run: npm run build
-
-      - name: Publish to npm
-        run: npm publish --access public
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}