perf: fuse PPO logprob entropy computation#2144
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Replace the separate logprob and entropy paths with a fused autograd helper and remove the unused production legacy helpers. Add CPU torch/gloo coverage plus a 1-GPU legacy Megatron parity test, and register both tests in the PR workflow.
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Replace the separate logprob and entropy paths with a fused autograd helper and remove the unused production legacy helpers.
Add CPU torch/gloo coverage plus a 1-GPU legacy Megatron parity test, and register both tests in the PR workflow.