fix default output model name length

[mayinghan]

Note

Enforces a 63-character max for output model names and generates safe defaults by truncating with a hash when necessary.

• RFT CLI (eval_protocol/cli_commands/create_rft.py):
  • Validate --output-model length (<=63); print error and exit if exceeded.
  • Continue to auto-generate trainingConfig.outputModel when not provided.
• RFT Utils (eval_protocol/fireworks_rft.py):
  • Update build_default_output_model to ensure names <=63 by truncating base and appending a 6-char hash + -rft-<uuid4[:4]>.
  • Add hashlib import for hashing.

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