Health Check

Liveness, plus WHICH COMMIT is answering.

version is a static string and always has been; it says nothing about the deployed code. The commit fields are the ones that let you tell "the fix is not deployed" from "the fix is deployed and did not fire" — a distinction that cost 30p and an hour on 2026-08-05 for want of exactly this. commit_source is reported so a caller can see whether the value came from the platform or from a local working tree; unknown means we could not establish it, and is never filled with a placeholder.