// Law 1: Dual-Core Inversion Contract
type ExecutionEngine struct {
    phase   PhaseState // IDLE | PLAN | EDIT | REVIEW | SYNC | LEARN
    bounded bool       // Tier 1 indirect control harness
}

func (e *ExecutionEngine) Transition(target PhaseState) error {
    if !ValidPhaseTransitions[e.phase][target] {
        return fmt.Errorf("ERR_PHASE_VIOLATION: cannot skip %s -> %s", e.phase, target)
    }
    e.phase = target
    return nil
}