Support effective Gemma 4 text weights#3587
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Signed-off-by: Hugh Ryan <197298026+HueCodes@users.noreply.github.com>
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Adds support for Gemma 4 effective text checkpoints by loading PLE weights, shared KV layers, layer
scalars, and double-wide shared-layer MLPs.
Also updates the Gemma 4 example to handle text weights stored under
model.language_model.Fixes #3448.