chore: fix model arg to new syntax

.github/workflows/claude.yml

@@ -39,7 +39,7 @@ jobs:
           plugin_marketplaces: 'https://github.com/anthropics/claude-code.git'
           plugins: 'code-review@claude-code-plugins'
           prompt: '/code-review:code-review ${{ github.repository }}/pull/${{ github.event.pull_request.number }}'
-          model: 'opus'
+          claude_args: '--model claude-opus-4-6'
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
 
@@ -80,7 +80,7 @@ jobs:
         uses: anthropics/claude-code-action@v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          model: 'opus'
+          claude_args: '--model claude-opus-4-6'
 
           # This is an optional setting that allows Claude to read CI results on PRs
           additional_permissions: |