Contribution relative to the source

The classical descent, sourced family, and switching obstruction reproduce the mechanisms of VI CheungVI. The additional content of this adaptation is:

• an explicit supported domain separating local propagation from a nonexistent global conical Cauchy premise;

• a distinction between the background cone and the formal unknown metric coefficients;

• a finite table combining descended evaluations with a separately typed representative-gap witness;

• a complete destructive-clock readout, its approximation bound, and a fully charged payload-and-code route.

The potential impact is methodological rather than a new gravitational dynamics claim: a classical obstruction can be preserved in an operational certificate without being relabelled as an anomaly, while a valid classical quotient can be represented without pretending that an unknown field has been measured.