fix(ci): install Claude Code via npm to avoid install.sh 403 (#8701)

The claude-code-action's built-in installer uses
`curl https://claude.ai/install.sh | bash` which can fail with 403.
Due to the pipe, bash exits 0 on empty input, masking the curl failure
and leaving the `claude` binary missing.

Work around this by installing Claude Code via npm before invoking the
action, and passing the executable path via path_to_claude_code_executable.

Co-authored-by: Copilot <copilot@github.com>

.github/workflows/claude-code-review.yml

@@ -31,11 +31,20 @@ jobs:
         with:
           fetch-depth: 1
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install Claude Code
+        run: npm install -g @anthropic-ai/claude-code
+
       - name: Run Claude Code Review
         id: claude-review
         uses: anthropics/claude-code-action@v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          path_to_claude_code_executable: claude
           allowed_bots: "*"
           plugin_marketplaces: 'https://github.com/anthropics/claude-code.git'
           plugins: 'code-review@claude-code-plugins'