docs: production-level README with Table of Contents, npm, Stripe, and E2E sections#9

blackboxprogramming merged 11 commits intomainblackboxprogramming/codex-agent-runner:mainfrom

copilot/update-readme-for-productionblackboxprogramming/codex-agent-runner:copilot/update-readme-for-productionCopy head branch name to clipboard