A Modular Gate-and-Kernel Architecture for Early-Universe Mechanism Building

Early-universe mechanism papers often begin from a reduced description that already assumesan effective background, a structured seed state, a prepared carrier or source state, or anasymmetry-processing stage. This note introduces a four-module gate-and-kernel architecturethat separates those assumptions into descendant-background establishment, seed-state genesis,source preparation, and baryogenesis. Each module asks when a stage-specific language has beenearned and exports an interface state that a later module may use only if the relevant interfacewitness is open. The central formal result is an admissible-path criterion combining local modulegates with adjacent interface gates. The same architecture also supports a research-map program:local maps classify occupied and candidate tuples within one module, while interface and chainmaps classify admissible edges and ordered multi-stage paths. A single reheating temperature,for example, can be an inadmissible interface when a downstream flavor calculation dependson the full reheating trajectory. The architecture is deliberately modest. It does not replacedetailed dynamics; it makes early-universe language, composition, and research-space explorationauditable one module at a time. At present the baryogenesis module and its research mapprovide the first worked proof of principle, while the upstream maps remain future work