Correct the validator split section to clarify that jsonschema is
not removed — it remains the JSON Schema validator for both paths
(BAST meta-schema validation and standard JSON payload validation).
Only the custom keyword registration path is removed. Also fix the
build_validator and validate_json entries in the engine changes
table to reflect that they are repurposed, not removed.
Proposes replacing custom JSON Schema keywords with a standalone
kind-based JSON format (BAST) using / for composition.
Covers format design, meta-schema, engine changes, validator split,
codegen future, ABI adapter potential, migration path, 7 open
questions, and 4 proposed POCs.
deepseek-v4-pro