Update api spec (#256)

* YOYO NEW API SPEC!

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kittycad/models/source_range.py

@@ -0,0 +1,14 @@
+
+from pydantic import BaseModel, ConfigDict
+
+from ..models.source_position import SourcePosition
+
+
+class SourceRange(BaseModel):
+    """A source range of code."""
+
+    end: SourcePosition
+
+    start: SourcePosition
+
+    model_config = ConfigDict(protected_namespaces=())