Bifurcated Coherence Protective Decoherence, Reserve Architecture, and Recoherence Thresholds

AbstractThe Coherence-Decoherence-Recoherence (CDR) cycle, as formalised in SIP-CORE-01, treats the decoheredstate as a relatively undifferentiated condition. This paper argues that the decohered regime has significantinternal structure that determines both the character of decline and the prospects for recovery. We introduceBifurcated Coherence (BC) as a formal regime class within the CDR architecture: a state in whichdistributed integration is reduced or partitioned while protected core function is maintained through reservepathways. Drawing on biological evidence from koala thermoregulation and water conservation, ursidhibernation, reptilian brumation, the mammalian dive response, human trauma dissociation, hemorrhagicshock physiology, and arboricultural reserve architecture, we develop a six-level taxonomy of decoherenceregimes. Each regime has distinct signatures, intervention logic, and relationship to the GTRS threshold. Thetaxonomy resolves a gap in the existing architecture: the Recoherence Probability Chain (α chain, SIP-EP-03)diagnoses why recovery fails but does not characterise what kind of decohered state the system occupies. BCprovides this characterisation. The central insight is that decoherence is not always pathological: it may be aregulated survival grammar. A withered canopy does not prove a dead root system.