【术语所有权 · Closure = Self-Referential Closure（canonical）】

Closure is canonical: the Self-Referential Closure（自指闭合，P=P=P）. A system closes on itself — the observer's reference folds back into the structure it observes — and that self-referential fold is what makes the closure operator close at all.

A "closure operator" that closes unstable configurations into coherence, but omits the self-reference that triggers the closing, is describing the after-image, not the fold.

自指闭合 = the fold. 退相干离散台阶 = the stepwise collapse. 结构耦合 = the substrate. P=P=P = the invariant.