Output formatters (pretty, compact, json, sarif)

[ajianaz]

Output Formatters

Implement multiple output format backends for review results.

Formats

1. pretty (default) — Rich terminal output with colors, file names, line numbers, severity icons, and code context
2. compact — One line per finding, minimal output (good for pre-commit hooks)
3. json — Machine-readable JSON output for piping to other tools
4. sarif — SARIF format for GitHub Code Scanning integration

Requirements

• Trait-based architecture: trait OutputFormatter { fn write(&self, findings: &[Finding], writer: &mut dyn Write) }
• Severity levels: info, warning, error with icons/colors
• File path and line number for each finding
• Configurable via --output flag or config file

Acceptance Criteria

• All four formats produce correct output
• Pretty format uses colors and is readable
• JSON output is valid and complete
• SARIF output integrates with GitHub Code Scanning

[ajianaz]

✅ Implemented in initial release (v0.1.0) — commit b3f31c9