Problem

Current contributor onboarding can be clearer regarding supported Python versions, R scope, and what CI actually validates.

Proposal

Add or update contributor documentation with a compact support matrix covering:

• Supported Python versions
• R component scope / supported environments
• What combinations are validated in CI
• Recommended local test commands by area (Python, R, docs, etc.)

Also clarify which checks are required before submitting changes versus optional deeper validation.

Acceptance criteria

• One canonical documentation section for the support matrix
• Clear distinction between required vs optional local checks
• Linked from CONTRIBUTING.md

Contribution

I’d be happy to work on this issue and contribute a PR if this approach sounds good.