add chunk size

[benjibc]

Note

Add RFT rollout chunking CLI option (--chunk-size) and pass it through as chunkSize; add GSM8k test logging; update .gitignore.

• CLI (RFT):
  • Add --chunk-size option in eval_protocol/cli.py for rollout batching.
  • Propagate to job payload as chunkSize in eval_protocol/cli_commands/create_rft.py.
• Tests:
  • Add start/end rollout info logging in tests/pytest/gsm8k/test_pytest_math_example.py.
• Repo config:
  • Update .gitignore to ignore eval-protocol.

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