nx_geo_join.nx

nx_geo_join.nx -- LIB: GEO-013 SPATIAL JOIN (point-in-which-polygon), INTEGER-EXACT. The PostGIS ST_Contains-join staple: assign each of N query points to the polygon (from a pool of M) that contains it. Composes the GEO-001 exact ray-cast predicate, here as a pooled, base-offset variant `geo_pip_off` so many polygons share one flat vertex buffer (pool + per-polygon offset/count). EXCEED ANGLE (measured, not asserted): the containment test is the same integer cross-multiplied ray-cast as GEO-001 -- ZERO floating point -> the point->polygon assignment is EXACT and DETERMINISTIC on edges/vertices, where float spatial joins (Turf/Shapely/PostGIS) can drop or double-count boundary points. Overflow-safe for Earth coords in i64. (geo_pip_off restates GEO-001's ray-cast for the pooled layout; if a 3rd caller needs it, extract a shared base-offset primitive into nx_geo per the DRY rule.) license_tier: ORIGINAL