tg_geometry 0.3.0

Defines TG::Geometry with immutable Geom parsing and constructor wrappers, expanded geometry predicates and accessors, Rect helpers, Hex/GeoBIN writers, raw extra_json access, read-only borrowed Line/Ring/Polygon and GeometryCollection child wrappers, value Segment wrappers, Registry reload sugar, optional ActiveRecord source helpers, and an immutable geofencing-oriented Index with owned and borrowed geometry ingestion, flat/rtree strategies, deterministic ordered id results, exact rtree allocation accounting, and native-endian packed point batch queries, and FeatureSource GeoJSON FeatureCollection extraction/build paths over vendored C sources. Ractor support is not claimed.