GAPT protocol: edges that defend themselves

GAPT protocol is a data structure where the gap between two nodes is a first-class citizen. Every connection carries a voidguard that inspects data before it may pass, a bridgetype that labels the relationship, and an edgelock that controls who may initiate a transmission. The gap keeps memory, escalates threat levels, learns to trust repeated clean travellers, and survives restarts. This is the 0.12 release (typed edges / edge lock) plus later updates, under Aetherion Substrata Ltd. Free for individuals and solo builders; commercial use is paid. Code and release: https://github.