Add the missing [model] section to moe_small.toml

[Naeemkh]

Summary

• configs/model/moe_small.toml was missing its [model] header, so its 13 keys landed at the top level of JobConfig and were rejected with Unknown config keys. It is the only one of four model presets that fails to load.

Testing

• uv run ruff check kempnerforge/ tests/ passes
• uv run ruff format --check kempnerforge/ tests/ scripts/ passes
• uv run pyright kempnerforge/ passes (0 errors)
• uv run pytest tests/unit/ -v --timeout=60 passes
• If distributed code changed: uv run torchrun --nproc_per_node=4 -m pytest tests/distributed/ -v
• If training loop / parallelism / optimizers changed: uv run pytest tests/e2e/ --e2e -v

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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