nx_biome_classifier.nx

nx_biome_classifier.nx -- Whittaker / Holdridge biome classifier. Cross-cutting Substrate C primitive per nxc2/docs/NISHI_GAME_ENGINE_ROADMAP.md. The foundational LOGIC layer for guided / god procgen -- where pure noise samples uniformly, this primitive routes climate + elevation through a biome decision table so downstream generators (vegetation density, species spawn, settlement growth) get to place features WHERE THEY MAKE SENSE. "Forest near a river, desert where it's dry" -- this is the primitive that says so. Inputs (all Q14): temperature_c_q14: mean annual temperature in degrees C rainfall_mm_q14: mean annual rainfall in mm elevation_m_q14: elevation above sea level in metres Output: sealed-enum biome kind (13 values). Use the classifier-driven downstream primitive `nx_growth_field` (queued) to spawn the actual vegetation / ores / settlements per biome. Classification scheme: Whittaker 1975 simplified 2D (temp x rain) + Holdridge altitudinal adjustment. Reasonable cuts at standard climate boundaries (frost line at 0 C; treeline at ~3000 m; tropical/temperate cutoff at 18 C). Per cardinal `feedback-no-third-party-trust-native-or-nothing`, classification thresholds are derived from public-domain climate science, never copied from a proprietary engine. Loss audit: classification is BAND-DECISION; no continuous information lost beyond Q14-quantised inputs. Downstream generators read the sealed-enum verdict and apply their own continuous biases (e.g. forest density tapers within the TEMPERATE_FOREST band toward the band's edges). genealogy_id: whittaker_1975_community_ecology + holdridge_1947_life_zones lineage_id: nx_biome_classifier_whittaker_holdridge_2d_q14 nx_safety_envelope: