v0.2.4 - Narrow gri-plot to parametric shapes and shape-derived observables. Dropped TdoaSurface, FdoaSurface, TerrainSurface, IntersectionField, gradients/, and the marching-cubes extraction path (removes the scikit-image dependency). Remaining observables: AoaSurface (Cone), LosSurface (Cylinder), RangeSphere (Sphere). - Add FrameTransformer tests covering transform_bounds across XYZ/ENU/ LLA, XYZ passthrough, LLA round-trip, and ENU axis labels. - Migrate coverage config from .coveragerc into pyproject.toml and lower fail_under to 50 - much of gri-plot is visualization code that is not meaningfully unit-testable without a display server.