{
  "schema_version": "imprint_reader_v3_canonical_only_metaquery224_20260829",
  "identity": {
    "reader_id": "Unique semantic update ID",
    "knowledge_id": "Legacy-compatible adapter routing ID; equal to reader_id",
    "behavior_id": "Non-empty only for behavior updates",
    "update_type": [
      "knowledge",
      "behavior"
    ]
  },
  "source_contract": {
    "required": [
      "reader_id",
      "knowledge_id",
      "update_type",
      "title",
      "category",
      "subcategory",
      "context",
      "question",
      "answer",
      "variants",
      "reader_target",
      "sample_hash"
    ],
    "variants_per_source": 8,
    "legacy_behavior_alias": "canonical_fact equals canonical_behavior for behavior rows"
  },
  "teacher_contract": {
    "messages_key": "messages",
    "routing_key": "knowledge_id",
    "strict_match_keys": [
      "sample_hash",
      "meta_query"
    ],
    "target_key": "actor_sft_target",
    "targets_per_source": 4,
    "prompt_pool_size": 224,
    "prompt_selection": "random.Random(prompt_seed + qa_index).shuffle; take first four",
    "target_format": "canonical fact or canonical behavior only"
  }
}