Add comprehensive tools and skills documentation

[Copilot]

Documents the complete technology stack and required skills for contributing to HAX, addressing the lack of centralized technical onboarding information.

Changes

• Created TOOLS_AND_SKILLS.md: Comprehensive guide covering:

  • Core stack: TypeScript 5.0+, React 18/19, Python 3.11+
  • Frontend: Radix UI, Tailwind CSS, Monaco Editor, Chart.js, XYFlow
  • CLI: Commander.js, Inquirer, tsup, npm workspaces
  • Backend: Flask, Prometheus metrics, Docker
  • AI integration: CopilotKit framework
  • Development setup, commands, and learning resources

• Updated README.md: Added "Tools and Skills" section linking to comprehensive guide

Notes

• Version differences between root and CLI workspaces are explicitly documented (e.g., React 18 vs 19, Zod 3 vs 4)
• References both GitHub Actions workflows: test-and-build.yml (validation) and ci.yaml (full pipeline)

Original prompt

explain the tools/skills used for HAX

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