SPIRALbase Hybrid-J: Block-Structured Associative Memory with Shared Core, Local Stability, and Controlled Proximity Bridges

SPIRALbase Hybrid-J presents a block-structured associative-memory architecture designed to bridge two earlier SPIRALbase lines: partitioned pseudo-likelihood memory with strong context isolation, and projector-gated shared memory with strong selective access. Hybrid-J separates a small shared core, stable local attractor blocks, and explicit low-rank bridges between nearby contexts. Internal staged validation supports local stability, useful cross-context association, and a three-factor view of selective bridging based on bridge direction, accessibility amplitude, and cue-conditional gating.