Add a benchmarks directory with prompts.json, requirements.txt, results/.gitkeep, and run.py to measure Claude output token counts (normal vs caveman) using the Anthropic client. run.py supports dry-run, multiple trials, saving JSON results, computing stats, and optionally updating the README benchmark table; it reads the caveman SKILL.md for the system prompt. Also add .gitignore entries and expand README.md with badges, a Benchmarks section, sample table, and usage instructions.
