feat(lea): add dashboard competence promotion dry run

visual_workflow_builder/backend/api/lea_competences.py

@@ -9,6 +9,10 @@ from core.competences.verdicts import (
     iter_competence_verdicts,
     store_competence_verdict,
 )
+from core.competences.promotions import (
+    CompetencePromotionError,
+    promote_competence_from_verdicts,
+)
 
 
 lea_competences_bp = Blueprint(
@@ -59,3 +63,41 @@ def list_competence_verdicts(competence_id: str):
         "write_back_enabled": False,
         "yaml_write": False,
     })
+
+
+@lea_competences_bp.route("/<competence_id>/promote", methods=["POST"])
+def promote_competence(competence_id: str):
+    """Dry-run or apply a supervised dashboard promotion."""
+
+    payload = request.get_json(silent=True) or {}
+    try:
+        promotion = promote_competence_from_verdicts(competence_id, payload)
+    except KeyError:
+        return jsonify({
+            "success": False,
+            "error": f"Competence '{competence_id}' introuvable",
+        }), 404
+    except CompetencePromotionError as exc:
+        return jsonify({
+            "success": False,
+            "error": str(exc),
+            "write_back_enabled": False,
+            "yaml_write": False,
+        }), 400
+
+    status = 200 if promotion.get("dry_run") or promotion.get("duplicate") else 201
+    return jsonify({
+        "success": True,
+        "competence_id": competence_id,
+        "promotion": _public_promotion_payload(promotion),
+        "dry_run": promotion.get("dry_run", False),
+        "write_back_enabled": not promotion.get("dry_run", False),
+        "yaml_write": bool(promotion.get("write_applied", False)),
+    }), status
+
+
+def _public_promotion_payload(promotion: dict):
+    return {
+        key: value for key, value in promotion.items()
+        if not str(key).startswith("_")
+    }