Adapt Power Platform skills for Codex

[geekjapan]

Summary

• adapt repository and plugin guidance so Codex can consume plugin skills as standalone skill folders
• simplify all SKILL.md frontmatter to Codex-friendly metadata with only name and description
• rewrite canvas-apps workflows to run in a single Codex agent instead of relying on Claude task orchestration
• update key skill references in code-apps to use relative paths that Codex can follow directly

Validation

• ran git diff --check
• verified all SKILL.md frontmatters contain only name and description

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[lesaltzm]

We haven't used codex very much. Does it actually fail if these frontmatter fields are present, or does it just ignore them? IMO we shouldn't make the skills worse for Github Copilot and Claude just for Codex.