{
  "contract_version": "gab_302_contract_v1",
  "gab_id": "GAB-302",
  "canonical_name": "DocumentLearningSourceCard",
  "module_owner": "EdTechDocumentLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "source_card_id",
    "document_ref",
    "source_title",
    "source_type",
    "known_metadata"
  ],
  "optional_fields": [
    "title",
    "reliability",
    "primary_cta",
    "source_notice",
    "fallback_text_summary"
  ],
  "field_types": {
    "document_ref": "object{src,kind,alt}",
    "source_type": "enum['caricature','letter','photo','map','chart','table','poster','speech','extract','article','mixed']",
    "known_metadata": "array<{field,value,known:boolean,why}>  — known:false = non connu, jamais inventé",
    "reliability": "object{score:number(0..1),label,rationale}",
    "primary_cta": "object{label,action}"
  },
  "constraints": [
    "Un champ non connu porte known:false + why explicite — interdiction d'inventer une métadonnée.",
    "primary_cta : bouton structurel (HTML), libellé venant du JSON.",
    "reliability.score dans [0,1] si présent ; fiabilité = signal, jamais une note officielle."
  ],
  "blocked_conditions": [
    "known_metadata vides",
    "source_type absent",
    "document_ref absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 0 erreur" },
    { "case": "champ requis manquant", "expected": "BLOCKED listant le champ" },
    { "case": "métadonnée inconnue (known:false)", "expected": "affichée 'non identifié' + why, jamais inventée" },
    { "case": "instance externe injectée", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-302",
    "note": "Ce schema VALIDE l'instance. Le contrat pédagogique complet (input_contract/validation_logic/feedback_scoring_logic) vit dans le CORE-GAB officiel, pas ici (évite la duplication)."
  }
}