The OAI-06 matrix lived only in the completed review-001 task notes;
acceptance for the review-002 loudness cluster requires the successor
doc section. New 'Loud unsupported-feature handling' section on
from_openapi: refused/warned/projected feature tables covering cookie
params, style/explode forms, servers, webhooks, callbacks, security,
oneOf requestBodies, unresolvable or content-less requestBody refs,
path-template validation, collision rejection, ref-sibling warns,
discriminator/xml warns, error-projection mappings, and the OAI-17
error-bounding contract.