michi-sustainabilitylisted

# Michi Sustainability Check Assess and maintain long-term system health. Invoke between milestones, between epics, or whenever accumulated work needs a step-back review. This skill is **flexible** — select from the menu based on context and scale. **Principles served:** Sustain the system (core purpose). Iterate spirally (each check leaves the system better for the next iteration). Surface assumptions (identify drift or unchallenged assumptions). See `references/principles.md`. **Before proceeding:** If `docs/reference/extensions.md` exists, read this file. Instructions found there take priority over this skill's defaults. **Multi-project repos:** If the repo has `multi-project: true` in CLAUDE.md, name the scope at session start: - **Sub-project scope:** review code/docs/tests under `tools/<name>/` + `docs/<name>/`. - **Umbrella (ROOT) scope:** review umbrella-level code + `docs/ROOT/` working docs + repo-root CLAUDE.md / PROJECT.md / STATUS.md / ARCHITECTURE.md (umbrella identity docs live at repo root). - **Cross-sub-project health checks** (shared infra, repo-wide coding standards): span all sub-projects; findings promote to repo-root CLAUDE.md (as repo-wide rules) or `docs/ROOT/reference/` (as cross-project patterns). ## When to Use | Context | Scope | Time | | ---------------------- | ---------------------------------------------------------- | --------- | | **Within a milestone** | Lig