- JSON Schema validator now enforces propertyNames, patternProperties, dependentRequired, dependencies, if/then/else, contains, and prefixItems instead of silently accepting values that violate them; unevaluated* still permissive but warns once.
- Recursive $ref no longer short-circuits to true on revisit: cycle detection keys on (ref, value-identity) with a primitive depth cap, so nested sub-schema violations are caught.
- Meta-validator now structurally validates if/then/else/dependencies sub-schemas and accepts draft-07 dependencies as either schemas or string-array dependent keys.
- Wire-schema null normalization no longer strips null-valued unknown root fields before preserveUnknownRootFields snapshots them, so task.simple and similar callers still see disallowed null arguments.
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