II. Coordination and Its Failure Epistemic Deficit as a Diagnostic Instrument for Collectives. Second article in the series "The Spiral and the Summit: Five Turns of an Epistemic Stance"

This article — the second in the series The Spiral and the Summit: Five Turns of an Epistemic Stance — develops the thesis inherited from the first turn: if information, computation, and substrate are productively regarded as three aspects of one process, then coordination failures in collectives of any substrate must share a common structure. Two cases of coordination failure, chosen for maximum substrate dissimilarity, are analysed in the vocabulary of the discipline to which each belongs. The first is biological: the regeneration of two-headed planarians (Dugesia japonica) following transient blockade of gap junctions, as documented by the laboratory of Michael Levin at Tufts University. The second is digital: the cascade failure of Amazon S3 in the US-EAST-1 region on 28 February 2017, in which no individual component exceeded the bounds of its specification yet the system as a whole failed. In each case, the disciplinary vocabulary — developmental biology in the first, reliability engineering in the second — proves structurally unable to describe the failure it has discovered: a condition termed here descriptive failure. The analysis identifies four points at which this descriptive failure manifests, and shows that these four points coincide across the two cases without reformulation. The article then introduces the epistemic deficit profile — an instrument developed by the author in a separate line of work on knowledge-graph verification — and demonstrates that its four dimensions (distributedness of representation, coherence, observability of the boundaries of one's own knowledge, and capacity for revision) stand in direct structural correspondence with the four empirically derived points of descriptive failure. This correspondence constitutes the synthesis of the second turn: coordination failure is not an event localisable in a single component but a structure describable by the epistemic deficit profile, and the restoration of coordination is not the repair of a broken part but the restructuring of the collective's distributed representation along the dimensions of the profile. The relation of the profile to Tononi's integrated information theory is briefly examined. Limitations are stated explicitly: two cases suffice for discovery of the structure but not for proof of its universality; full operationalisation of the profile — with quantitative metrics, construction procedures, and applicability criteria — is reserved for the third article. The condition transmitted to the third turn is formulated: if the epistemic deficit profile is a measurable structure, then a diagnostic protocol is possible, and the somatic mutation theory of cancer is identified as the material on which that protocol will be tested.