ci: add Publish MCP workflow

Mirror publish-cli.yml for @moemail/mcp: trigger on mcp-v* tags or manual
dispatch, install + bun build, then npm publish --access public using
secrets.NPM_TOKEN.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/publish-mcp.yml

@@ -0,0 +1,39 @@
+name: Publish MCP
+
+on:
+  push:
+    tags:
+      - 'mcp-v*'
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+          cache: 'pnpm'
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Install MCP dependencies
+        run: cd packages/mcp && pnpm install
+
+      - name: Build
+        run: cd packages/mcp && bun build ./src/index.ts --outdir ./dist --target=node
+
+      - name: Publish to npm
+        run: cd packages/mcp && npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}