{
  "contract_version": "gab_203_contract_v1",
  "gab_id": "GAB-203",
  "canonical_name": "PlayEngineMixedActivityStepper",
  "module_owner": "EdTechPlayEngine",
  "renderer_key": "text_cta",
  "required_fields": [
    "gab_id",
    "stepper_id",
    "title",
    "steps",
    "progress_label",
    "primary_cta"
  ],
  "optional_fields": [
    "initial_step_index",
    "back_cta",
    "skip_cta",
    "skip_blocked_message"
  ],
  "field_types": {
    "steps": "array<{index:number, emoji:string, title:string, sub:string, mod_class:enum['story','visual','interactive','exercise','memory','game','audio'], mod_label:string, module_owner:string, skippable:boolean}>",
    "initial_step_index": "number — index de départ du stepper (0-based)",
    "primary_cta": "string — libellé du bouton Continuer",
    "back_cta": "string — libellé du bouton Retour",
    "skip_cta": "string — libellé du bouton Passer",
    "skip_blocked_message": "string — message affiché quand skip refusé"
  },
  "constraints": [
    "steps doit contenir au moins 2 éléments.",
    "Chaque step doit avoir un module_owner explicite (nom du module source de vérité).",
    "skippable:false = skip interdit pour cette étape ; le moteur affiche skip_blocked_message.",
    "PlayEngine orchestre les étapes mais n'écrit jamais de reward/XP/badge (= PlayKit).",
    "primary_cta : libellé structurel venant du JSON."
  ],
  "blocked_conditions": [
    "steps absent ou vide (BLOCKED)",
    "stepper_id absent (BLOCKED)",
    "title absent (BLOCKED)"
  ],
  "accessibility": [
    "keyboard_navigable",
    "focus_visible",
    "prefers_reduced_motion",
    "step_dots_aria_labels",
    "fallback_text"
  ],
  "qa_cases": [
    { "case": "instance conforme", "expected": "rendu complet, 0 erreur, stepper navigable" },
    { "case": "steps vide ou absent", "expected": "BLOCKED listé dans le moteur" },
    { "case": "stepper_id absent", "expected": "BLOCKED listé dans le moteur" },
    { "case": "step skippable:false → clic skip", "expected": "skip_blocked_message affiché, navigation bloquée" },
    { "case": "step skippable:true → clic skip", "expected": "avance à l'étape suivante" },
    { "case": "instance externe injectée via init(ext)", "expected": "le rendu change sans modifier le HTML" },
    { "case": "responsive 375/768/1024", "expected": "aucun débordement horizontal sur le stepper-row" }
  ],
  "traceability": {
    "derived_from_core_gab": "GAB-203",
    "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)."
  }
}