{
  "contract_version": "gab_395_contract_v1",
  "gab_id": "GAB-395",
  "canonical_name": "DataLearningCompareValues",
  "module_owner": "EdTechDataLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "compare_values_id",
    "data_ref",
    "value_a",
    "value_b",
    "comparison_task",
    "comparison_policy"
  ],
  "optional_fields": [
    "title",
    "unit",
    "base_value",
    "difference_type",
    "ratio_note",
    "rounding_policy",
    "fallback_text_summary"
  ],
  "constraints": [
    "Comparer uniquement valeurs compatibles.",
    "Afficher unité et base.",
    "Différence absolue ≠ différence relative.",
    "Pourcentage nécessite base claire.",
    "Arrondis déclarés si utilisés."
  ],
  "blocked_conditions": [
    "compare_values_id absent (BLOCKED)",
    "data_ref absent (BLOCKED)",
    "value_a absent (BLOCKED)",
    "value_b absent (BLOCKED)",
    "comparison_task absent (BLOCKED)",
    "comparison_policy absent (BLOCKED)",
    "unités de value_a et value_b différentes sans politique de conversion (BLOCKED)"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text"
  ],
  "qa_cases": [
    {
      "case": "instance conforme",
      "expected": "rendu complet, données affichées, CTA actif"
    },
    {
      "case": "champ requis manquant",
      "expected": "BLOCKED listant le champ absent"
    },
    {
      "case": "instance externe via init(ext)",
      "expected": "le rendu change sans modifier le HTML (critère d'or)"
    },
    {
      "case": "responsive 375/768/1024",
      "expected": "aucun débordement horizontal"
    }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-395",
    "note": "Ce schema VALIDE l'instance. Le contrat pédagogique complet vit dans le CORE-GAB officiel."
  }
}