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

[Copilot]

README was largely empty (a blank features list, duplicate license blocks, no table of contents) and contained no actionable setup, billing, or testing information.

Changes

• Table of Contents — numbered, anchor-linked index covering all 14 sections
• Overview — enterprise-scale context (30k agents, Stripe billing, Cloudflare/Railway, CodeQL)
• Features — filled in from actual workflow capabilities (was a single blank bullet)
• Technology Stack — table: Node 20, Next.js, Stripe, Clerk, Cloudflare Pages, Railway, CodeQL
• npm Installation — npm install codex-agent-runner, peer deps, JS usage example, scripts table
• Configuration — .env.example template covering Stripe, Clerk, Cloudflare, and DEPLOY_URL
• Stripe Integration — pricing tiers table, webhook setup steps, usage-metering code snippet, Stripe CLI test-mode instructions
• Deployment — auto-deploy flow for both Cloudflare Pages and Railway targets; secrets reference table
• E2E Testing — Playwright commands, test coverage table (auth, billing, agent runner, webhooks, health, brand), CI pipeline description
• Project Structure — full file tree including src/, tests/, .env.example
• Housekeeping — added npm version + live-app badges; corrected GitHub org URLs to blackboxprogramming; consolidated duplicate license sections

Original prompt

Please get everything to the ReadMe that is production level and ready for npm and stripe we need FORMALITY now we have over 125,000 files guys we need indexes in READMEs ! For production level. It is our marketing page simple and literally please all check e2e we need this production level 12 months ago

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