{
  "contract_version": "gab_253_contract_v1",
  "gab_id": "GAB-253",
  "canonical_name": "CollaborationLearningSharedAnswer",
  "module_owner": "EdTechCollaborationLearning",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "shared_answer_id",
    "shared_answer_type",
    "shared_answer_types",
    "pipeline_steps",
    "primary_cta"
  ],
  "optional_fields": [
    "title",
    "subtitle",
    "doc_version_label",
    "contributors",
    "autosave_interval_s",
    "conflict",
    "secondary_cta",
    "version_tag"
  ],
  "field_types": {
    "shared_answer_type": "enum['duo_answer','group_synthesis','parent_child_answer','oral_outline','co_written_paragraph']",
    "shared_answer_types": "array<{key:string, title:string, sub:string, cta:string}> — 5 valeurs enum strict",
    "pipeline_steps": "array<{step:number, label:string, status:enum['done','active','pending']}>",
    "contributors": "array<{initial:string, name:string}>",
    "conflict": "object{active:boolean, count:number, detail:string}",
    "primary_cta": "object{label:string, action:string}",
    "secondary_cta": "object{label:string, action:string}",
    "autosave_interval_s": "number"
  },
  "constraints": [
    "shared_answer_type doit correspondre à l'une des 5 clés de shared_answer_types.",
    "pipeline_steps : exactement 3 étapes (Proposition/Fusion/Validation), 1 seule 'active' à la fois.",
    "primary_cta : bouton structurel (HTML), libellé venant du JSON.",
    "conflict.active:false → la conflict-box est masquée.",
    "version_tag 'V1_X' indique le flag safety/versioning — conserver pour audit."
  ],
  "blocked_conditions": [
    "shared_answer_type absent",
    "shared_answer_types vides",
    "pipeline_steps vides",
    "primary_cta absent"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "fallback_text",
    "aria_buttons_labeled"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, pipeline 3 étapes, enum 5 chips, 0 erreur" },
    { "case": "champ requis manquant", "expected": "BLOCKED listant le champ" },
    { "case": "clic enum_chip", "expected": "titre/sous-titre/cta se mettent à jour sans modifier le HTML" },
    { "case": "conflict.active:false", "expected": "conflict-box masquée" },
    { "case": "instance externe injectée", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal, pipeline en colonne sur mobile" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-253",
    "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)."
  }
}