Optimize: remove redundant 7x7 convs from CfC heads, simplify spatial mix (40% faster CfC, 60% fewer large convs)

Update README with VAE integration and verified datasets

v2: Add VAE latent training, fix datasets, streaming support

Update README with VAE and verified datasets

V2: Add VAE, fix datasets, streaming, precaching

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Add comprehensive README

Add Colab training notebook

Fix GroupNorm for arbitrary channel counts

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initial commit