docs(standards): add reusable Tier-B template scaffolds (pipeline family, shared loader/registry, converters, scripts)

standards/src/templates/app/domain/item/ports/converters.py

@@ -0,0 +1,18 @@
+"""# Summary
+
+Optional converters for the item slice — pure functions mapping between domain
+types. Add a converter here when a service must reshape data; keep it pure.
+"""
+from domain.item.models import Item
+
+
+def to_item(data: dict) -> Item:
+    """Build an :class:`Item` from a raw mapping.
+
+    Args:
+        data (dict): Field mapping matching the item model.
+
+    Returns:
+        Item: The constructed item model.
+    """
+    return Item(**data)