Causal-Smoothing Vacuum Substrate: A Minimal Conditional Route to Einstein's Equations

This note reorganizes the Causal-Smoothing Vacuum Substrate (CSVS) research proposal into a minimal set of explicit physical postulates. Its derivation of the Einstein equations uses the previously established local-horizon thermodynamic argument of Jacobson [2]; that mathematical result is not claimed as original. The proposed microscopic identification of the horizon entropy and metric is presently a hypothesis, not a completed microphysical derivation. The note does not claim quantum gravity, black-hole singularity resolution, or a measured prediction of Newton’s constant. Relationship to earlier work. This is a focused, standalone work-in-progress companion to the author’s prior CSVS paper [1]; it does not supersede the earlier results until the microscopic closure has been established.