App panels: Model-at-a-glance, EAD & EIR method, How-grounding-works, Notes header link (dossier-v2 propagation)

Ship macro/FRED interpretation feature: per-variable coefficient interpretation fields (unit_meaning/transformation/lag/fred_series/economic_channel/hazard_ratio_per_unit/worked_example) across variable_dictionary, coefficients, macro_glossary, freddie/hazard; UI hazard-ratio column + expandable interpretation panels + How-to-read intro panels.

UI v3: fintech-direction design pass (5 grafts), waterfall historical-mode fix, explain-strip placement + shared hook, palette contrast fix

Ship App v2 + Tier-2 sandbox (5-tab UI, analyze_data, contract-first API)