What is new, and what is not

The gravitational action, its signs, its Noether identity, and the fixed-input obstruction belong to XI-A. The host and destructive clock interface belong to the I-B/X-A-ST framework CheungIB,CheungXAST.

The present assembly makes explicit:

1. the local tensor-density transfer with the two signature conventions kept separate;

2. the distinction between a switching-region detector and a plateau-local equation problem;

3. a complete finite reporting channel with a specified rational-approximation metric;

4. the coverage requirements that separate a finite report from an identity on an unrestricted residual space.

No priority claim is made for the general variational, linear-algebraic, or channel principles used in this assembly.