ac-executelisted

1. Verify `PLAN_FROZEN=true` and `Execution Contract` completeness. 2. Set `CURRENT_ROLE: executor`. 3. Change only files listed in `Files to change`. 4. Follow `Steps` exactly and run required `Checks`. 5. Record results in `验收证据（Evidence）` and update Top 3 completion. 6. Hand off to `$ac-review`. Unfreeze fallback (mandatory): 1. Stop execution immediately when new design/scope appears. 2. Append a decision log entry with date, decision, and impact. 3. Set `PLAN_FROZEN: false` and `CURRENT_ROLE: planner`. 4. Return to `$ac-plan` for a new Contract. Hard rules: - Do not add design alternatives during execution. - Do not edit files outside the Contract scope.