Each file-scope function definition now carries the full
//+---+ / //| description | / //+---+ box, matching the rest of the
project and the listings in the article. Comments only: no logic,
signature or behaviour is changed.
Five-file library (scenarios, priors, dual solver, views, posterior),
closed-form checks, a demo with replay, a walk-forward forecast test,
the EP_ViewCost indicator and the EP_Sizer expected-shortfall sizing EA,
with a README covering the method, the evidence and the layout.
