Users are now prompted to choose their preferred font family and roughness style during both `setup` and `update`. Preferences are saved to ~/.claude/skills/excalidraw-skill/preferences.json, which the MCP server already reads at startup via loadPreferences(). This ensures third-party users who install via npx get preferences configured before first use. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>