Method save

atomic-agent/src/provenance/accumulator/convert.rs:143–174

Persist the graph to disk at `{session_dir}/graph.json`. Uses atomic write (temp file + rename) to prevent corruption.

(&self, session_dir: &Path)

    ///
    /// Uses atomic write (temp file + rename) to prevent corruption.
    pub fn save(&self, session_dir: &Path) -> AgentResult<()> {
        // Ensure the session directory exists
        std::fs::create_dir_all(session_dir).map_err(|e| AgentError::SessionSaveFailed {
            session_id: self.session_id.clone(),
            reason: format!("create session dir: {}", e),
        })?;

        let path = session_dir.join(GRAPH_FILENAME);
        let tmp_path = path.with_extension("json.tmp");

        let serialized = self.to_serialized_graph();
        let data = serde_json::to_string_pretty(&serialized).map_err(|e| {
            AgentError::SessionSaveFailed {
                session_id: self.session_id.clone(),
                reason: format!("provenance graph serialize: {}", e),
            }
        })?;

        // Write to temp file
        std::fs::write(&tmp_path, data.as_bytes()).map_err(|e| AgentError::SessionSaveFailed {
            session_id: self.session_id.clone(),
            reason: format!("provenance graph write temp: {}", e),
        })?;

        // Atomic rename
        std::fs::rename(&tmp_path, &path).map_err(|e| AgentError::SessionSaveFailed {
            session_id: self.session_id.clone(),
            reason: format!("provenance graph rename: {}", e),
        })?;

        Ok(())
    }

    /// Serialize to the full JSON-compatible representation.
    pub fn to_serialized_graph(&self) -> SerializedGraph {