catch prime api context length errors

[daspartho]

Description

prime api context length error phrase isn't in the catch list.

prime api returns "This endpoint's maximum context length is..." not in context_length_phrases, so OverlongPromptError isn't raised and eval crashes instead of graceful handling.

Type of Change

• 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

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

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• 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
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

one line change.

---

Note

Improves overlong-prompt error handling to cover Prime API responses.

• In verifiers/envs/environment.py, extend context_length_phrases to include "this endpoint's maximum context length is", ensuring BadRequestError with this message is mapped to vf.OverlongPromptError rather than a generic failure.

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[daspartho]

other providers also have uncaught phrasings. happy to add those, or could consider a more robust way to catch.