The V3-to-V4 README described the main representation changes but did not
enumerate the complete admission and preservation rules. That left reviewers
without a package-owned reference for supported histories, child evidence,
native validation, or cases that must fail without publishing a successor.
Document historical conversion separately from native V4 admission, including
source renames and collisions, first-class tool results, child catalogs,
delivery metadata, retained identities and references, lifecycle checks,
developer-message constraints, fork behavior and recovery entry points.
Explicitly identify the retired-wrapper refusal and the limited scope of
general content validation rather than implying a complete payload validator.
Require this transformation/admission catalog in the version-addition
cookbook so future adjacent migrations document each supported mapping,
unchanged representation, refusal and preservation obligation. Preserve the
accepted-baseline policy: compatible V4 additions use new acknowledgements;
only breaking changes require a new writer version.
Tianyi Cui
5152c097bb