This document outlines a coordinated research program examining how deep-time physical constraints shape the long-term architecture, stability, and detectability of technological systems across stellar systems and galactic populations. The program integrates analyses of communication latency, exportability filtering, thermodynamic maintenance scaling, and elemental throughput limits with population-level infrared tests designed to probe observational consequences in galaxy catalogues. Rather than assuming centralized, high-contrast technosignatures, the framework evaluates survivorship under physical constraint and examines how deep-time filtering may suppress large-scale energetic variance. This document serves as the structural overview and reading guide for the Deep-Time Structural Constraints series.