🔧 chore(ci): Use OAuth token for Claude Code Action (#570)

Switch from API key to OAuth token authentication so the action
uses the existing Claude Max subscription instead of separate API billing.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jamesrweb

.github/workflows/claude.yml

@@ -37,7 +37,7 @@ jobs:
         id: claude
         uses: anthropics/claude-code-action@v1
         with:
-          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
 
           # Optional: Customize the trigger phrase (default: @claude)
           # trigger_phrase: "/claude"