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* chore: add mermaid CLI to sandbox image with usage instructions Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: mount host ~/.ssh into sandbox and install openssh-client Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: remove sample diagram Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: address PR review comments on mermaid CLI setup Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>