feat(docs): added feature card and docs page for exercism

[lvogel04]

Summary

What are you adding?

• Bug fix (non-breaking change which fixes an issue)
• New benchmark/evaluation
• New model provider
• CLI enhancement
• Performance improvement
• Documentation update
• API/SDK feature
• Integration (CI/CD, tools)
• Export/import functionality
• Code refactoring
• Breaking change
• Other

Changes Made

• Added new feature card and exercism docs page

Testing

• I have run the existing test suite (pytest)
• I have added tests for my changes
• I have tested with multiple model providers (if applicable)
• I have run pre-commit hooks (pre-commit run --all-files)

Checklist

• My code follows the project's style guidelines
• 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 (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Related Issues

Closes #

Additional Context

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Note

Adds Exercism multi-language code agent benchmark docs and replaces the SciCode featured card with an Exercism card linking to it.

• Docs:
  • New benchmark page: Add docs/evals/exercism.mdx detailing the Exercism multi-language code agent benchmark (features, usage, dataset structure, scoring).
  • Catalog update: In docs/benchmarks/catalog.mdx, replace the SciCode featured card with an Exercism card (icon: code, href: /evals/exercism, updated label/description).

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