For mHC implementers, SyneState is a direct application of manifold-constrained mixing to cross-modal binding. For cognitive science and clinical researchers, it offers a candidate prosthetic for the double-empathy problem: bridging communication gaps not by "fixing" either party, but by learning the translation between different cognitive compression schemes.
All required components—multi-stream residuals, Sinkhorn projection, multimodal attention heads—exist in production stacks today. This is integration work, not research.
Whether or not a prior request exists in the system in processed or unprocessed state should not matter in a properly implemented idempotent system, the whole point is that one and only one is processed, and all replicas indicate that they are such.
What you do inside of your boundary to implement that idempotent contract need not be part of the contract and the decision of what primitives to use (locking, content-based addressing etc) are mainly just a question of implementation constraints.