feat: implement CLI with rich output and configuration

[leoneperdigao]

Description

Implement the full command-line interface for Quantum-Safe Guardian with rich terminal output, configuration file support, baseline management, and multiple output modes. The CLI is the primary user interface for running scans locally and in CI/CD pipelines.

Tasks

• Implement CLI commands:
  • scan: Run one or more scanners against target paths/URLs
  • report: Generate reports from saved scan results
  • init: Create a default .quantum-safe.yml configuration file
  • version: Show version and build information
  • baseline: Manage baseline files (create, update, diff)
• Add rich terminal output:
  • Color-coded severity indicators (red=critical, yellow=warning, blue=info)
  • Formatted finding details with file path, line number, and code context
  • Summary table at end of scan
  • Use rich library for terminal formatting
• Implement configuration file support:
  • YAML format (.quantum-safe.yml or .quantum-safe.toml)
  • Scanner selection and configuration
  • File include/exclude patterns
  • Severity thresholds
  • Output format selection
  • Custom algorithm severity overrides
• Implement baseline file functionality:
  • Suppress known findings by hash
  • --update-baseline flag to add current findings
  • Show new findings vs. baseline in output
  • Support baseline expiration dates
• Add output modes:
  • --quiet: Only output summary line (for CI)
  • --verbose: Include debug information and scan details
  • --format: Select output format (table, json, sarif, csv)
  • --output: Write results to file
• Implement progress bar for large scans (using rich.progress)
• Write CLI tests using click.testing.CliRunner or typer.testing.CliRunner

References

• rich library
• click testing
• typer CLI