Define the five-step ladder (native-schema prevention, repair, shape
validation, bounded feedback re-ask, ResultInvalidError) as D14;
rewrite section 7.9 accordingly, give the structured parameter its
three-tier semantics in the chat() signature, and scope the bounded
re-ask outside transport retry and breaker counting.
Record tenacity vs self-built evaluation as D13 in ARCHITECTURE.md
(self-built wins: per-attempt orchestration, cancellation guarantees,
supply-chain discipline). Add research-wiki/ROADMAP.md expanding the
milestone table with ordering rationale and exit criteria.
iomgaa