trunk/e417f6dfacaf7f00dce343adc0d48d8fcc8fb2e2: [dynamo] Model sourceless DynamicClassAttribute (#199260)

发生了什么

Summary Fix the remaining base types.DynamicClassAttribute failure from the CPython 3.13 port. DynamicClassAttribute is a pure-Python descriptor. When one is created inside a compiled class body and later read raw through C.__dict__["attr"] , Dynamo sends that ephemeral descriptor through SourcelessBuilder . The builder had no case for the exact DynamicClassAttribute type, so it graph-broke with "Unexpected type in…

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