trunk/55448714fb1bf93b4946225675aa1c6f70cfe3e4: [dynamo] Type value-builder ingress as object (#196176)

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Summary replace Any with object at the selected private Dynamo value-builder ingress points keep concrete SourcelessBuilder.create overloads while making the fallback strict type local mapping callbacks and the functools.partial keyword accumulator so values stay narrowed through classification These changes make missing branch-local narrowing visible without changing runtime behavior. The catch-all SourcelessBuilde…

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