nx_food_clean_source.nx

nx_food_clean_source.nx -- LIB: the CLEAN-SOURCING badge that joins the stir-fry SITE to the impact ECONOMICS (operator: "we gain more profit and they spend less via them buying from us"). For the vegetables in a chosen build that Nishi grows regeneratively (present in the impact catalog), it aggregates the per-item customer savings vs conventional and renders a sovereign no-JS "Clean sourcing" section for the recommendation page -- so the diner SEES, on the same page that picks their dish, that the produce we source is cleaner AND cheaper. HONEST BY CONSTRUCTION: only ingredients ACTUALLY in the catalog count (im_field_int < 0 == absent), the section states how many, and a non-catalog ingredient is reported as not-yet-covered -- never a faked number. The seeded estimates VARY truthfully (onion/garlic are low-residue even conventionally -> small clean gap; bok choy / snow peas higher -> larger gap), so the badge cannot greenwash. Reuses nx_impact accessors; integer cents only (no float); each record CITEs the regenerative-agriculture corpus. license_tier: ORIGINAL