Document bundled skill installation across agent tools

[Ring-wdr]

Summary

• document Codex, Claude Code, Gemini CLI, and skills.sh installation paths for the bundled CLI skill
• clarify that the repo bundles skills but does not auto-install them
• point repository contributors to the separate
  eact-devtool-cli-repo skill

Testing

• not run (README-only change)

[Ring-wdr]

Reviewed the README diff. No blocking issues found for this docs-only change; it now covers Codex, Claude Code, Gemini CLI, skills.sh, and the repo-specific skill split.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: cbf6fa07fe

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[Ring-wdr]

Reviewed the current docs-only diff. No blocking issues found in the README, skill installation guidance, or branch-protection governance wording. Merge is still blocked by the repository rule requiring one approving review from someone other than the PR author.