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+# Scalar Fields / SDF Status
+
+SDF and scalar field modeling are temporarily removed from the supported SimpleCADAPI surface.
+
+Current contract:
+
+- `simplecadapi.field` is not exported.
+- `make_field_surface_rsolid` is not exported.
+- `*_rscalarfield` APIs are not generated in public API docs.
+- `make_field_surface_rsolid` is not a canonical graph op.
+- Model JSON replay does not rebuild scalar field surfaces.
+
+Historical payloads or examples that rely on scalar field trees should be treated as unsupported until a new SDF contract is designed.