[code-reflection] RFR: ONNX fixes [v2]

[Paul Sandoz]

On Mon, 15 Sep 2025 08:54:10 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> This patch includes:
>> - `OnnxTransformer` fix of returning in-code constructed list of tensors
>> - `README.md` fix of the examples execution
>> - workaround to avoid CNFE when the `ReleaseEnv` class is attempted to load in the above shutdown hook from already closed classloader
>
> Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:
> 
>   CNFE workaround moved to static initializer

Marked as reviewed by psandoz (Lead).

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PR Review: https://git.openjdk.org/babylon/pull/565#pullrequestreview-3225263655