当 cc 需要和用户一起产出已批准 spec，并在进入 planning 前做 worker 对抗式 review 时使用。
Use when the user explicitly asks to start a cc-leader workflow, run a multi-phase development plan, or says 'cc-leader'. Do not auto-activate on every session.
当某个 phase 执行完成后，worker 需对照 plan 做 phase review；全部 phase 通过后，再做 spec 级 final review 时使用。
Use when the user wants to start or continue a cc-leader workflow, write a spec, or says '/cc-leader-spec'. Guides spec drafting, resume, and adversarial review.
Use when the user wants a detached worker (Codex or Claude) to execute an arbitrary user-specified task and keep going automatically when the worker merely asks whether to continue.
当已审过的 phase task list ready，且 worker 要逐 task 执行并在每步后追加结果时使用。
当所有 phase 和 review 都通过后使用。此时由 cc 基于 artifact 链写最终详细报告。
Use when the user wants to execute a cc-leader workflow after spec approval, or says '/cc-leader-run'. Auto-advances through plan, task, execute, review, report.