Update documentation to reflect current implementation status master
- 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(migration, output formats, quiet/verbose) - Configuration and environment variables - Troubleshooting section Removed outdated "commands are stubs" messaging and added accurate feature descriptions for all implemented functionality.