{
  "contract_version": "gab_133_contract_v1",
  "gab_id": "GAB-133",
  "canonical_name": "ExerciseTimerChallenge",
  "module_owner": "EdTechExerciseLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "exercise_id",
    "title",
    "question",
    "duration",
    "primary_cta",
    "options"
  ],
  "optional_fields": [
    "feedback_success",
    "feedback_wrong",
    "feedback_timeout",
    "cta_restart",
    "cta_running"
  ],
  "field_types": {
    "duration": "integer — secondes de compte à rebours (≥ 5)",
    "options": "array<{text:string, correct:boolean}> — exactement 1 élément correct:true",
    "primary_cta": "object{label:string, action:string}",
    "feedback_success": "string — peut contenir {elapsed} comme placeholder de substitution",
    "feedback_wrong": "string",
    "feedback_timeout": "string",
    "cta_restart": "string",
    "cta_running": "string"
  },
  "constraints": [
    "options doit contenir exactement 1 entrée avec correct:true.",
    "duration >= 5 (secondes) pour éviter un chrono anxiogène non pédagogique.",
    "primary_cta.label : libellé structurel du bouton de démarrage.",
    "Le moteur substitue {elapsed} dans feedback_success par le nombre de secondes réellement utilisées."
  ],
  "blocked_conditions": [
    "options absent ou vide",
    "duration absent",
    "question absente",
    "aucune option avec correct:true"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "timer_urgency_visual_only_no_sound"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, chrono fonctionnel, 0 erreur" },
    { "case": "champ requis manquant (question absente)", "expected": "BLOCKED listant le champ" },
    { "case": "aucune option correct:true", "expected": "BLOCKED — pas de bonne réponse" },
    { "case": "options absentes", "expected": "BLOCKED listant le champ" },
    { "case": "réponse correcte choisie avant timeout", "expected": "feedback_success, chrono stoppé" },
    { "case": "réponse incorrecte choisie avant timeout", "expected": "feedback_wrong + highlight bonne réponse" },
    { "case": "timeout sans réponse", "expected": "feedback_timeout + highlight bonne réponse" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal" },
    { "case": "prefers-reduced-motion activé", "expected": "animations réduites, chrono fonctionnel" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-133",
    "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)."
  }
}