docs: contextify repository

[maknop]

Summary

This PR adds comprehensive documentation to the repository through the contextify pipeline, which generates standardized documentation files for AI agents and human developers.

Changes

New Files Created

• ARCHITECTURE.md (205 lines) - Comprehensive architecture documentation covering:
  • System overview (three-tier architecture: Frontend → Backend proxy → External APIs)
  • Monorepo structure and workspace relationships
  • Plugin architecture (frontend-only with proxy-based API access)
  • Component hierarchy and data flow
  • Key design decisions and tradeoffs
  • Backend plugin composition and database strategy
  • Deployment approach (Docker + dynamic plugin export)
• AGENTS.md (70 lines) - AI agent instruction file with:
  • Project overview and dependencies
  • Development commands (install, test, build, lint)
  • Architecture summary (links to ARCHITECTURE.md for details)
  • Code style guidelines (@backstage/cli, TypeScript 5.8)
  • Testing conventions (Jest, Playwright)
  • Deployment process (dynamic plugin export, Docker)
  • Common mistakes (6 Backstage-specific pitfalls)
• CLAUDE.md (2 lines) - Pointer file to AGENTS.md for Claude Code integration
• CONTRIBUTING.md (100 lines) - Contribution guidelines covering:
  • Getting started (fork, branch, setup)
  • Pull request process
  • Commit message conventions
  • GPG/SSH signing requirements
  • AI-assisted commit message disclosure
  • Code review expectations

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Generated with

🤖 Contextify - AI-powered repository documentation generator

Co-authored-by: Claude Sonnet 4.5 noreply@anthropic.com