Implement draft spectrogram-based model specfmv0#27
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This commit also contains some updates to the pinned dependencies in the `uv.lock` file. It might be a good idea to re-visit the dependencies once we have made more progress on the project.
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This PR is a draft implementation of the spectrogram-based model, consisting of "convolve-through-time" encoder/decoder pairs for each diagnostic and actuator inputs, and a low-rank feature-space/channel-space mixing operation that is sandwiched between the encoder concatenation and decoder slicing operations.
The encoder heads were designed to be as close as possible to the original ResNet, making it possible for us to proceed by exploring modifications made by ResNeXt, ConvNeXt, and ConvMixer. The mixing operation is heavily inspired by MLPMixer, and needs to be careful investigated once we get the ball rolling.
Closes #4.