pub fn install_system_skills(codex_home: &Path) -> Result<(), SystemSkillsError>Expand description
Installs embedded system skills into CODEX_HOME/skills/.system.
Clears any existing system skills directory first and then writes the embedded skills directory into place.
To avoid doing unnecessary work on every startup, a marker file is written with a fingerprint of the embedded directory. When the marker matches, the install is skipped.