Function save 

pub fn save(artifact: &DefectArtifact, path: &Path) -> Result<()>

Serialize artifact as compact JSON and write it to path, creating parent directories as needed.

Mirrors the calibrate command’s write idiom exactly: serde_json::to_vec (compact, not pretty) so byte-determinism tests over identical inputs are meaningful, not an artifact of formatting.

Errors

CodeLoreError::Analysis if serialization fails (should not happen for a well-formed DefectArtifact); CodeLoreError::Io if the parent directory cannot be created or the file cannot be written.