fix the base model requirement

[xzrderek]

Note

Enforces mutually exclusive --base-model and --warm-start-from flags (trimming empty/whitespace) and conditionally builds the trainingConfig accordingly.

• CLI (eval_protocol/cli_commands/create_rft.py):
  • Validation: Require exactly one of --base-model or --warm-start-from; error if both or neither are provided.
  • Input normalization: Trim whitespace on both flags and treat empty strings as unset.
  • Training config: Build trainingConfig dynamically, setting baseModel or warmStartFrom only when provided; remove previous unconditional baseModel requirement.

^{Written by Cursor Bugbot for commit 61ca3d7. This will update automatically on new commits. Configure here.}