//! Minimal file-change model used by TUI diff rendering and approval previews.use std::path::PathBuf;use serde::Deserialize;use serde::Serialize;#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]#[serde(tag = "type", rename_all = "snake_case")]pub(crate) enum FileChange {    Add {        content: String,    },    Delete {        content: String,    },    Update {        unified_diff: String,        move_path: Option<PathBuf>,    },}