Research question
How should causal reach be defined when observable distance and duration are generated quantities?
SMM/DTT direction
The programme distinguishes private generation order from physical propagation between completed records. Cosmological causal structure must be defined using the latter and the independently calibrated geometry and clocks.
What the construction must establish
Specify propagation, expansion, and initial conditions. Show how distant regions acquire the relevant correlations without substituting a generative scan for an observed signal.