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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.