[Shaan-Shoukath]

Summary

• The UX pattern spec is now Space Works UX, our own interaction system. docs/ux-yuyu-spec.md is renamed to docs/ux-spec.md, and Yuyu is credited as its inspiration.
• Across ux-spec.md, ux-screens-longtail.md and ui-brand-spec.md, the Yuyu source citations now refer to "reference boards", and the board IDs are renamed from Y1–Y28 to R1–R28. The wireframes show the Space Works brand instead of the Yuyu one.
• The Starlight site has:
  • a new UX → Space Works UX page
  • a homepage card linking to it
  • the spec page title "Space Works UX spec" (its URL /specs/ux-patterns/ is unchanged)
  • updated Credits and Brand introduction pages
• README contents and credits are updated. references/yuyu/ is kept as an attributed source.
• Also includes two earlier dev commits that added and then removed the mobile UX spec, so their net change is zero.

Test plan

• cd site && npm run build passes, and starlight-links-validator reports that all internal links are valid.
• The remaining "Yuyu" mentions are attribution only (README credits, the spec's origin note, the UX page, the Credits page).

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