Remove standard_version from layer.yaml and INTENT.md frontmatter (A12),
mark layer.yaml derived from INTENT.md (A11), and add tests asserting the
derived markers, the absence of a standard version, and agreement of the
two forms after an ASCII case fold over the closed four-token vocabulary
(A9). Layer values are left as spelled: INTENT.md Engine, layer.yaml engine.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 63291@bnt-lap001
Assistant-Session: 8bd77868-ca68-4f49-bb1e-d539ecc0d703