Chain-Address Invariants, Long-Form Cohesion, and Bidirectional Packet Transport

Chain-Address Invariants for Long-Horizon AI Systems: Long-Form Cohesion, Post-Arrival Compression, and Bidirectional Reconstruction develops a companion method to Active Traversal and Load-Bearing Dependency II (ATLD 2) for preserving continuity across long reasoning and handoff chains. The paper addresses a specific long-horizon failure mode: a sequence of individually plausible transitions can gradually lose the governing object, mission, boundary conditions, provenance, or intended destination. It formalises a two-stage approach in which the complete performed chain is retained during discovery, but compression is prohibited until the destination has been independently verified. After verified arrival, the successful chain becomes evidence from which a smaller reusable object may be extracted. The method distinguishes the full discovery history from a chain address, a load-bearing invariant, the transported payload, and its boundary and provenance state. Candidate invariant packets are subjected to minimum-sufficiency pressure, selective deformation and restoration, cold-start reconstruction, payload and carrier substitution, counter-route testing, stale-address detection, and a separately typed return path that does not assume invertibility. The work is directly associated with ATLD 2, particularly its treatment of exact object/address custody, future-sufficient continuity and re-entry, receiver-side closure, and fixed-point completion. It does not introduce an additional ATLD coordinate. Instead, it develops an operational continuity and transport architecture arising from those burdens. The paper includes explicit strongest-fair-null comparisons with ordinary summarisation, sufficient representations, Information Bottleneck approaches, routing and cache compression, hidden-history effects, answer smuggling, local handoff protocols, and other simpler established alternatives. Its stronger methodological claim remains prospective: the architecture should reduce or collapse into the simpler account if matched testing shows no additional continuity, drift-detection, reconstruction, or recovery value. This paper is the standalone publication counterpart of MKUFT Module 25D, Chain-Address Invariants, Long-Form Cohesion, and Bidirectional Packet Transport, and is published as a distinct companion to ATLD 2 rather than as a revision of the frozen ATLD 2 v2.0 publication. Version: 1.0DOI: 10.5281/zenodo.22102379Related ATLD 2 DOI: 10.5281/zenodo.22068803ATLD concept DOI: 10.5281/zenodo.21341520