Phase 1 step 2 and the POC Scope section now reflect that the POC has
run and succeeded, with a pointer to the POC Result section. The POC
code stays on this branch (commit f371fe4) as reference scaffolding and
is deliberately not merged to main — it is superseded by Phase 1 step 5.
Elevates the deferred AlkTypeError::Validation payload-shape question
to OQ-BAST-001 in the Decisions section. The POC kept the existing
jsonschema::ValidationError<'static> shape; the production refactor
must decide explicitly between keeping it (simplest, dependency
stays) or introducing a Validation(String) shape (drops jsonschema
from the error type, but is a semver-relevant public-API change).
glm-5.2
2719629621