Fix LayerNormEnsemble.from_layernorm without affine parameters#22
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Fixes LayerNormEnsemble.from_layernorm for non-affine nn.LayerNorm.
nn.LayerNorm(..., elementwise_affine=False) has no weight, and the previous fallback accessed module.running_mean, which is not defined for LayerNorm. This caused from_layernorm to fail with AttributeError.
Added a doctest covering the non-affine case.
Checks run:
.venv/bin/python -m xdoctest tabm.py
.venv/bin/python -m ruff check tabm.py
.venv/bin/python -m ruff format --check tabm.py
.venv/bin/python -m py_compile tabm.py