batch processing

[jonhilgart22]

Description

Brief description of what this PR does and why.

Batch processing used to fail if one item in the batch failed. Now, we retry that item individually and let the rest of the batch proceed.

Changes Made

• Added feature X
• Fixed bug Y
• Updated documentation Z
• Other: ...

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
• 🎨 Code style/formatting
• ♻️ Refactoring
• ⚡ Performance improvement
• 🧪 Test improvement

Testing

• Tests pass locally (uv run pytest)
• Added tests for new functionality
• Tested on multiple Python versions (if applicable)
• Tested with different LLM providers (if applicable)

Code Quality

• Code follows project style guidelines (uv run black . && uv run isort .)
• Type checking passes (uv run mypy langstruct/)
• Added appropriate docstrings
• Updated examples if needed

Documentation

• Updated README if needed
• Updated API documentation
• Added/updated examples
• Updated CHANGELOG.md

Checklist

• My code follows the style guidelines of this project
• 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
• 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 #(issue number)

Screenshots (if applicable)

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Additional Notes

Any additional information, concerns, or questions for reviewers.