Really neat clean code!

I like the single C file, but Docker if you want all the examples approach, that's really convenient for embedded.

Test coverage looks good as well, be interesting to see the metrics.

This would be quite cool for adding scripting to medical devices, avoiding the need to revalidate the "core" each time you change a feature.

An interesting comparison would be against an embedded WASM bytecode interpreter like https://github.com/bytecodealliance/wasm-micro-runtime, which is still much larger at 56.3K on a Cortex M4F. Maybe WASM is just a more complicated instruction set than the smallest RISCV profile?