Fix Theseus checkpoint loading - #93
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- Implement checks to ensure successor layers are properly initialized when loading a pretrained TheseusBert model. - Add tests to validate the behavior of the model when dealing with missing successor layer weights and ensure proper error handling for incomplete checkpoints.
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Theseus was reinitializing successor layers after every load, which discarded trained weights. This keeps saved successor weights, falls back to predecessor initialization for plain BERT checkpoints, and rejects partially saved successor state instead of silently mixing weights.
Tests cover native Theseus checkpoints, plain BERT checkpoints, and incomplete successor state.