Complete user documentation

[krjordan]

Write comprehensive documentation for v1.0 release.

Requirements

• User guide with all features
• CLI reference with examples
• TUI usage guide with screenshots
• Configuration file documentation
• Troubleshooting guide
• API documentation for hooks/webhooks

Acceptance Criteria

• README covers installation and quick start
• User guide covers all features
• Man page for CLI commands
• TUI keyboard shortcuts documented
• Configuration examples provided
• Troubleshooting for common issues