Add immutable turn-level training export v1 - #7

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Zeng-Weijun wants to merge 6 commits into

InternScience:mainfrom

Zeng-Weijun:feat/turn-training-export-v1-20260726

Commits on Jul 26, 2026

Add turn training export core
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Add turn training export contract tests
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Complete immutable turn training export
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Harden training export closure validation
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Preserve provider boundary failures in export
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Preserve interrupted and duplicate rollout exports
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