security: harden Campaign delivery effects and reconciliation

src/govoplan_campaign/backend/campaign/loader.py

@@ -7,6 +7,7 @@ from typing import Any
 
 from jsonschema import Draft202012Validator, FormatChecker
 
+from .mail_profile_boundary import assert_campaign_uses_mail_profile_reference
 from .models import CampaignConfig
 
 
@@ -83,6 +84,7 @@ def load_campaign_config(
     schema_path: str | Path | None = None,
 ) -> CampaignConfig:
     data = load_campaign_json(path)
+    assert_campaign_uses_mail_profile_reference(data)
     if validate_schema:
         validate_against_schema(data, schema_path=schema_path)
     return CampaignConfig.model_validate(data)