Implement a Claude Code skill that investigates and lists all environment variables that can be set when building Python wheels for a given project.

  - Input Validation: Must verify that input is a cloned git repository (fail fast if not cloned)
  - Search Scope: Investigate setup.py, CMake files, and other relevant build configuration files
  - Output Format: List of environment variables with short descriptions where available
  - Implementation: Use deterministic approach (e.g., Python script) for consistent results