cp: `feat: DTensorPolicyV2 GPT-OSS SFT support (1470)` into `r0.5.0`#1690

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yuki-97 merged 1 commit intor0.5.0from

cherry-pick-1470-r0.5.0

Dec 23, 2025

Commits on Dec 23, 2025

feat: DTensorPolicyV2 GPT-OSS SFT support (#1470)

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