Function run_skill_admin 

pub fn run_skill_admin(
    spec: &SkillSpec<'_>,
    action: SkillAction,
    options: &SkillOptions,
) -> Result<SkillReport, SkillError>

Install, uninstall, or report status of spec’s skill across the selected agent target(s).

Returns a typed SkillReport (caller serializes it for output) or a SkillError. Does not touch stdout/stderr.