{
  "contract_version": "gab_269_contract_v1",
  "gab_id": "GAB-269",
  "canonical_name": "ComprehensionLearningConceptBridge",
  "module_owner": "EdTechComprehensionLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "mindmap_id",
    "title",
    "summary",
    "center_node",
    "branches"
  ],
  "optional_fields": [
    "map_layout",
    "reason_title",
    "reason_body",
    "primary_cta",
    "secondary_cta",
    "icon",
    "leaves"
  ],
  "field_types": {
    "branches": "array<{id:string, label:string}> — exactement 4 éléments pour radial_4branch",
    "map_layout": "enum['radial_4branch','tree_hierarchy','flow_chronology','matrix_compare']",
    "primary_cta": "object{label:string, action:string}",
    "secondary_cta": "object{label:string, action:string}",
    "leaves": "array<{branch_id:string, items:string[]}>"
  },
  "constraints": [
    "branches : tableau de 4 éléments requis (id b1..b4, label string non vide).",
    "center_node : libellé court (≤ 30 caractères recommandé) pour tenir dans le nœud central.",
    "map_layout doit être une valeur de l'enum ; si absent, défaut radial_4branch.",
    "primary_cta.label vient du JSON — le bouton structurel HTML n'est jamais modifié."
  ],
  "blocked_conditions": [
    "branches absent ou vide",
    "center_node absent",
    "title absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 4 branches affichées, 0 erreur" },
    { "case": "champ requis manquant (branches vide)", "expected": "BLOCKED listant le champ" },
    { "case": "center_node absent", "expected": "BLOCKED listant center_node" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "canvas carte mentale sans débordement horizontal" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-269",
    "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)."
  }
}