Added docs/USABILITY_RESEARCH.md: what usability and information-architecture research has established about how people use websites and software, as 438 numbered rules in 23 parts, each with its source, written without reference to Magpie so that it can be used on another product. It covers how people behave on a screen, conceptual models, navigation, organizing and search, layout, writing, controls, forms, feedback and speed, errors and undo, defaults, first use and help, lists and tables, mobile, accessibility, interruptions, consistency, trust, measurement, claims to treat with caution, the canonical lists and the sources.
Added the ux skill (.claude/skills/ux/SKILL.md), invoked as /ux, which reads the design, usability, information-architecture, first-use, forms, settings and writing documents in full, finds the existing pages new work must match, requires the review questions to be answered before building, and checks the result against the rules that get broken most. AGENTS.md, CLAUDE.md, docs/README.md and docs/USABILITY_AND_INFORMATION_ARCHITECTURE.md now point to the new document.