[codex] Add direct Codex skill package

[Sabotage1]

Summary

Adds a self-contained Codex skill package at .codex/skills/ui-ux-pro-max.

The existing .claude/skills/ui-ux-pro-max package uses repository symlinks for data and scripts. Codex GitHub skill installation can download those symlinks as plain pointer files, which leaves the installed search script unusable. This package copies SKILL.md, data/, and scripts/ directly so Codex users can install from a GitHub tree path without resolving symlinks.

Also documents the direct Codex install URL in the README.

Validation

• Ran python3 .codex/skills/ui-ux-pro-max/scripts/search.py "fintech crypto" --design-system -f markdown

[mrgoonie]

Summary: I’m deferring this PR from the cron-safe maintainer lane because it is far too large for a bounded metadata-first review pass.

Decision: deferred / needs focused maintainer review

Evidence:

• Scope is 36 changed files with +9,933 lines.
• The title adds a direct Codex skill package, which is a packaging/distribution capability and needs source-of-truth, install-path, generated-asset, and platform compatibility review before code-level approval.
• Current cron policy defers PRs over 20 changed files or 800 additions to avoid shallow approvals of broad changes.

Next step: please narrow this PR or add a maintainer-ready design note explaining the intended canonical source files, generated/package artifacts, install target paths, verification commands, and why this Codex package should be separate from or integrated with the existing platform template system. After that, a focused maintainer review can check the implementation properly.