reversible-system-changelisted

# Reversible System Change Make one authorized persistent change without losing the ability to identify, restore, and verify the prior working state. ## Select One Phase - Plan or non-mutating workflow rehearsal: read `references/preflight-and-rollback.md`. Keep the entire phase read-only; do not create a candidate, backup, capsule, cache, remote record, or sensitive content access. - Authorized isolated restore rehearsal: read `references/preflight-and-rollback.md` only. Freeze an isolated non-active target and its complete write set, obtain exact rehearsal-write authority, and verify only the restore outcome. This phase may establish `rehearsed` evidence; it never authorizes candidate preparation, active promotion, the complete change, or cleanup. - Execute a complete authorized change: read `references/preflight-and-rollback.md` first. Read `references/execution-and-verification.md` only after the exact target, write set, promotion authority, rollback coverage, and current restore validation pass. - Conceptual explanations and pure status/version/availability queries do not select this skill or load either reference. ## Authority Boundary Resolve the requested outcome, exact target, authorized actions, and expected postcondition before mutation. Ask one concise question only when target, environment, destructive scope, credentials, sensitive asset use, promotion, or rollback authority would change execution. Keep an isolated restore rehearsa