Update documentation to reflect current implementation status
- README.md: Complete rewrite with all implemented features
- Comprehensive command overview (auth, repo, issue, pr, knot, spindle)
- Installation instructions (source + AUR)
- Quick start guide with examples
- Configuration and environment variables
- Examples for issues, PRs, and CI/CD
- Development workflow section
- AGENTS.md: Updated from initial handoff to current status doc
- Implementation checklist (all features marked as complete except spindle run)
- Architecture patterns (ServiceAuth, repo creation, listing, PR merging)
- Working with tangled-core reference
- Next steps for contributors (focus on spindle run)
- Troubleshooting guide
- docs/getting-started.md: Expanded from stub to comprehensive tutorial
- Step-by-step installation guide
- First steps (auth, list, create, clone)
- Detailed examples for issues, PRs, and CI/CD
- Advanced topics (migration, output formats, quiet/verbose)
- Configuration and environment variables
- Troubleshooting section
Removed outdated "commands are stubs" messaging and added
accurate feature descriptions for all implemented functionality.