{
  "contract_version": "gab_421_contract_v1",
  "gab_id": "GAB-421",
  "canonical_name": "ExamLearningIntro",
  "module_owner": "EdTechExamLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "exam_intro_id",
    "exam_type",
    "exam_goal",
    "exam_context_ref",
    "primary_cta"
  ],
  "optional_fields": [
    "title",
    "official_status_notice",
    "duration",
    "materials_allowed",
    "stress_support",
    "difficulty",
    "fallback_action",
    "fallback_text_summary"
  ],
  "constraints": [
    "Voir Core GAB pour le contrat pédagogique complet."
  ],
  "blocked_conditions": [
    "exam_intro_id absent (BLOCKED)",
    "exam_type absent (BLOCKED)",
    "exam_goal absent (BLOCKED)",
    "exam_context_ref absent (BLOCKED)",
    "primary_cta absent (BLOCKED)"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text"
  ],
  "qa_cases": [
    {
      "case": "instance conforme",
      "expected": "rendu complet, interactions actives"
    },
    {
      "case": "champ requis manquant",
      "expected": "BLOCKED listant le champ"
    },
    {
      "case": "init(ext) externe",
      "expected": "rendu change sans modifier le HTML (critère d'or)"
    },
    {
      "case": "responsive 375/768/1024",
      "expected": "aucun débordement"
    }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-421",
    "note": "Contrat pédagogique complet dans le CORE-GAB officiel."
  }
}