feat: add standards wiki, MCP registry, and app template

templates/app/domain/item/models.py

@@ -0,0 +1,19 @@
+"""# Summary
+
+Item domain model — the neutral resource used throughout the template.
+"""
+from pydantic import BaseModel, Field
+
+
+class Item(BaseModel):
+    """A single countable resource.
+
+    Attributes:
+        name (str): Item name.
+        quantity (int): Item quantity. Defaults to 1.
+    """
+
+    name: str
+    quantity: int = Field(default=1)
+
+    model_config = {"extra": "ignore"}