Add CodeRabbit configuration for automated PR reviews

[dsikka]

Summary

• Add .coderabbit.yaml configuration file to enable AI-powered code reviews
• Configure path-specific review instructions for Python code, tests, examples, modifiers, and documentation
• Set up path filters to exclude cache and build directories
• Link vllm-project/compressed-tensors repository for context on compressed model formats
• Enable auto-review, auto-apply labels, and issue enrichment features

Test plan

• Verify CodeRabbit bot activates on future PRs
• Confirm reviews focus on areas specified in path instructions (quantization algorithms, numerical stability, etc.)
• Check that excluded paths (build, cache directories) are ignored
• Validate auto-labeling functionality works as expected

🤖 Generated with Claude Code

[github-actions]

👋 Hi! Thank you for contributing to llm-compressor. Please add the ready label when the PR is ready for review.

Note: This is required to complete the testing suite, please only add the label once the PR is code complete and local testing has been performed.

[gemini-code-assist]

Code Review

This pull request introduces the .coderabbit.yaml configuration file to define AI review behaviors, path filters, and specific instructions for the repository. The review feedback suggests enhancing the configuration by adding more comprehensive path filters for Python artifacts and extending the review scope to include experimental directories for examples and quantization modifiers.

[dsikka]

@coderabbitai why did you stop running

[dsikka]

@coderabbitai review