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Add docs/UX_Guidelines.md covering web frontend patterns (theming, responsive design, accessibility, real-time data), REST API conventions, CLI interface, configuration wizard, error handling, branding, security UX, and inferred design principles. https://claude.ai/code/session_01LC9Yp36ARX47bmKavNPTcB Signed-off-by: Claude <noreply@anthropic.com>