Adds a "go_version" field to InfoResponse, populated via runtime.Version(). Useful for ops debugging (which Go version is running in production?). BDD scenario @critical asserts the field is non-empty. Doc + ADR-0026 updated.
Co-authored-by: Gabriel Radureau <arcodange@gmail.com> Co-committed-by: Gabriel Radureau <arcodange@gmail.com>