LLM context files

The markdown files below document low-level pieces of pirate. They double as context files for LLM coding assistants – the per-repo CLAUDE.md instructs the assistant to read the relevant one before working on a given area (e.g. C++ code or GPU kernels).

• C++ guidelines
• GPU kernels
• Pybind11
• Writing sphinx-friendly docstrings
• Thread-Backed Class Pattern
• CudaEventRingbuf