Function support_matrix_markdown 

pub fn support_matrix_markdown() -> String

Render REGISTRY as a markdown support matrix.

The column that matters is Parity. “Does it compile” and even “does it load” are not what a user needs to know before trusting a number — what they need is whether anyone has ever compared this port’s output against the reference implementation. Today two models have, and the table says so rather than leaving it to be inferred from which fixtures happen to exist (ferritin-100.13).

The copy embedded in the crate docs is checked against this function by test_lib_rs_support_matrix_is_current, so the two cannot drift.