D3: the constructed scalar and the causal separation

The map ${\mathsf{M}}_2$ is not proposed as a time-ordered construction satisfying ${\mathcal{I}}_{\mathrm{TO}}$. Its failure is the explicit witness that a causal axiom cannot be inferred from the free ones. The lemma neither changes the old products nor proves an obstruction to a future causal extension.

Observation operations remain numerical:

The inherited descendant estimate has test-order loss $64\to 64+\mathrm{ord}D$. It does not identify observation differentiation with configuration differentiation or open new functional slots.

Assigning a causal cutoff to $U_c$ would still require new product, descent, admission, and overlap proofs. No such assignment is made here.