Guard model config against eager Megatron imports#706
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Add a subprocess regression test that blocks top-level Megatron imports while building Qwen3 model config, and allow optional Megatron-adjacent deps in ty checks.
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Summary
megatronimports while building Qwen3 model config.tyunresolved-import config so fullprekchecks pass without those extras installed locally.Test plan
uv run prek run --all-files