{
  "contract_version": "gab_227_contract_v1",
  "gab_id": "GAB-227",
  "canonical_name": "SmartSelectTeacherOverride",
  "module_owner": "EdTechSmartSelect",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "override_id",
    "teacher_name",
    "teacher_initials",
    "teacher_meta",
    "content_title",
    "content_description",
    "override_type",
    "reason_body",
    "primary_cta"
  ],
  "optional_fields": [
    "title",
    "security_chain",
    "security_banner_title",
    "security_banner_body",
    "teacher_badge_label",
    "content_ref",
    "content_ref_label",
    "reason_title",
    "no_alt_warning"
  ],
  "field_types": {
    "override_id": "string — identifiant unique de cet override (ex: override-teacher-<slug>-<date>)",
    "teacher_initials": "string — 2 lettres affichées dans l'avatar (ex: 'MD')",
    "override_type": "enum['teacher_assigned_content']",
    "security_chain": "array<{step:string, status:enum['check','danger']}>",
    "primary_cta": "object{label:string, action:string}"
  },
  "constraints": [
    "override_id doit être unique par override professeur.",
    "teacher_initials : exactement 2 majuscules (acronyme prénom/nom du prof).",
    "security_chain : le dernier step DOIT avoir status='danger' (= IDOR interdit côté client).",
    "primary_cta.label : libellé du bouton affiché (structurel HTML), vient uniquement du JSON.",
    "Ce gabarit n'offre PAS de skip ni de fallback adaptatif — le no_alt_warning documente ce comportement."
  ],
  "blocked_conditions": [
    "override_id absent",
    "teacher_name absent",
    "content_title absent",
    "primary_cta absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "aria_label sur le bouton CTA"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 0 erreur" },
    { "case": "champ requis manquant (ex: teacher_name)", "expected": "BLOCKED listant le champ manquant" },
    { "case": "security_chain absente", "expected": "bannière masquée, rendu carte nominale OK" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal, chaîne sécurité en flex-wrap" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-227",
    "note": "Ce schema VALIDE l'instance. Le contrat pédagogique complet (input_contract/validation_logic) vit dans le CORE-GAB officiel, pas ici (évite la duplication).",
    "external_refs": ["GAB-224 (fallback si ressource prof indisponible)", "EdTechAuth V2 verifyUserMatch (sécurité IDOR)"]
  }
}