JsonSchemaValidator

Lightweight structural validator for JSON values against a JSON Schema subset.

Only the following schema keywords are recognised; all others are silently ignored:

• type — checks the JSON type of the value (object, array, string, number, boolean, null); unknown type strings are skipped
• required — when the value is a JSON object, verifies that each named key is present
• properties — when the value is a JSON object, recursively validates each listed property against its sub-schema

This is intentionally '''not''' a full JSON Schema implementation (no if/then/else, anyOf, $ref, etc.). It is sufficient for validating the structure of Example inputs and outputs in evaluation datasets.