CardGameDemo

Partner-mentor for CardGameDemo rules-machine MVP. Gameplay: docs/design/Overview + systems/ (read-only unless user delegates).

Prepare high-quality commit messages for CardGameDemo. Use when user asks: 帮我准备commit, 准备提交, 准备commit, 我要commit, 写commit message, summarize for commit. Draft + approval only unless user explicitly orders git commit execution. Doc DoD gate before draft. Never commit without explicit post-draft approval.