Rewrite README for a portfolio-focused, recruiter-friendly presentation

[Copilot]

The README was too contributor/setup-heavy for a job-search context. This update reframes it as a concise portfolio entry that quickly communicates the project’s purpose, technical scope, and engineering strengths.

• Reposition project framing

  • Replaced operational onboarding content with a short, high-signal overview of Patchwork as a full-stack AT Protocol platform.
  • Shifted the tone toward professional portfolio presentation rather than internal contributor guidance.

• Highlight employer-relevant strengths

  • Elevated the core technologies and engineering themes recruiters care about:
    • TypeScript monorepo design
    • React/Vite/Tailwind frontend work
    • Node.js backend services
    • testing and CI discipline
    • Docker/PostgreSQL/deployment readiness

• Condense repository context

  • Kept a minimal repo map for orientation without pulling the README back into long-form setup documentation.
  • Preserved a pointer to deeper architecture docs for readers who want detail.

## Technical strengths

- **Frontend:** React 19, Vite, Tailwind CSS, TypeScript
- **Backend:** Node.js services for API, indexing, and moderation
- **Architecture:** Shared packages, typed schemas, deterministic fixtures, service boundaries
- **Quality:** Unit tests, browser E2E tests, type checking, linting, automated CI
- **Operations:** Dockerized builds, health checks, deployment workflow, security scanning

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