Gradient Coupling Inquiry: a cross-domain gap-finding vault

An open research vault in cross-domain synthesis. Method: find places where two fields quantify the same object in different vocabularies and never cross-cite, measured by citation intersection; then build the missing shared object or prove it cannot exist. Includes the identity between Charnov's marginal value theorem and the Gittins index (C5), its restless-bandit extension with a giving-up-density prediction (C25), computed availability and repair-ratio axes for living tissue, a same-class disagreement catalogue with pre-registered predictions, and a full corrections log. Every count names its provider and fetch date. AI-assisted research: orchestrated by Claude Fable 5.1 with Claude Opus 4.8 agents via Claude Code; the human author sets scope and evidence standards and takes responsibility for all claims. Full disclosure in README.md.