Fix sentence-repeater env

[anakin87]

Description

When running vf-eval sentence-repeater -n 1 -r 1, I get the error

... File ".../verifiers/environments/sentence_repeater/sentence_repeater.py", line 88, in env_response "content": state["info"]["questions"][state["turn"]], ~~~~~^^^^^^^^ File ".../verifiers/verifiers/types.py", line 115, in getitem return super().getitem(key) ^^^^^^^^^^^^^^^^^^^^^^^^ KeyError: 'turn'

Replacing state["turn"] with len(state["trajectory"])

@willccbb @mikasenghaas

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Test improvement

Testing

• [x] All existing tests pass when running uv run pytest locally.
• [ ] New tests have been added to cover the changes

Checklist

• [x] My code follows the style guidelines of this project as outlined in AGENTS.md
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published

Additional Notes

Tested env with vf-eval sentence-repeater -n 1 -r 1