{
  "contract_version": "gab_224_contract_v1",
  "gab_id": "GAB-224",
  "canonical_name": "SmartSelectFallbackChoice",
  "module_owner": "EdTechSmartSelect",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "fallback_choice_id",
    "title",
    "fallback_reason",
    "reason_text",
    "alternatives",
    "primary_cta"
  ],
  "optional_fields": [
    "banner_label",
    "secondary_cta",
    "fallback_reason_enum",
    "distinction_note"
  ],
  "field_types": {
    "fallback_reason": "enum['content_unavailable','format_unavailable','level_unavailable','access_limited','technical_limit','no_exact_match']",
    "alternatives": "array<{rank:number, label:string, format:string, action:string}>",
    "primary_cta": "object{label, action}",
    "secondary_cta": "object{label, action}"
  },
  "constraints": [
    "fallback_reason doit appartenir à l'enum des 6 valeurs officielles.",
    "alternatives doit contenir au moins 1 entrée, ordonnée par rank.",
    "primary_cta est structurel (HTML) — son libellé vient du JSON.",
    "Ne jamais masquer un bug technique derrière un fallback pédagogique (224 ≠ 210).",
    "Le contenu de reason_text doit être honnête et explicatif, jamais générique."
  ],
  "blocked_conditions": [
    "fallback_reason absent",
    "alternatives vide ou absent",
    "primary_cta absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 0 erreur" },
    { "case": "fallback_reason absent", "expected": "BLOCKED listant le champ" },
    { "case": "alternatives vide", "expected": "BLOCKED listant le champ" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-224",
    "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)."
  }
}