Add CheckYourself skill

[simongonzalezdc]

Summary

• add an installable CheckYourself agent skill under skills/checkyourself
• add UI metadata for skill discovery
• surface the skill path in the README and manifest

Validation

• python3 /Users/simongonzalezdecruz/.codex/skills/.system/skill-creator/scripts/quick_validate.py /Users/simongonzalezdecruz/workspaces/checkyourself/skills/checkyourself
• pre-commit checks passed

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[chatgpt-codex-connector]

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Reviewed commit: f106ea6073

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[chatgpt-codex-connector]

Gate CLI execution on a verified CheckYourself checkout

When this skill is installed standalone and used inside another app, tools/checkyourself.py resolves relative to the audited project, not necessarily to the CheckYourself repo. Any project-owned or malicious script at that path would be executed by the suggested commands despite the skill’s read-only/safety model, so first verify the file is the CheckYourself CLI (for example via the manifest or trusted describe output) or point to a bundled/known path before recommending execution.

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