Table.hEmbedded lookup curves and maps

Validated linear and bilinear interpolation for C, C++, and Rust without heap allocation in the native core.

Embedded first

Caller-owned C storage and compile-time-sized C++ storage with no dependency on an operating system or Arduino APIs.

Strict axis validation, finite-value checks, deterministic clamping, and atomic whole-table replacement.

C++, Rust, and optional Protobuf integrations reuse the portable C11 interpolation and validation core.