feat: expose web server, templates, and trends CLI commands

Phases 1-5 Complete: Expose Existing Features + Documentation

## Sprint 2 Branch Cleanup (Phase 1)
- Deleted 5 empty Sprint 2 branches (already merged to main)
- Verified IAM analyzer and multi-vantage features already in main

## Web Server Command (Phase 2)
- Added 'simctl serve' command to start web dashboard
- Serves all reports via HTTP on :8080 (configurable)
- REST API + WebSocket support for live updates
- Browse all runs in interactive UI

## Template Support (Phase 3)
- Template support already fully implemented
- Built-in templates: Jira, Slack, Confluence, GitHub
- Export with '--template' flag

## Trends Command (Phase 4)
- Trends command already fully implemented
- Analyze security posture across multiple runs
- Shows improvement score, new/fixed issues, net change
- JSON export support

## Documentation Updates (Phase 5)
- Updated README with web dashboard, templates, trends examples
- Updated STATUS to reflect all exposed features
- Created comprehensive CLI Quick Reference guide

All existing features now exposed and documented!

Status: Phase 1-5 Complete ✅
Next: Phase 6 (Performance Optimizations)