Enabling CWD Saving for Image-Gen (#13607)

Codex now saves the generated image on to your current working
directory.

codex-rs/protocol/src/items.rs

@@ -89,6 +89,9 @@ pub struct ImageGenerationItem {
     #[ts(optional)]
     pub revised_prompt: Option<String>,
     pub result: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    #[ts(optional)]
+    pub saved_path: Option<String>,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, TS, JsonSchema)]
@@ -254,6 +257,7 @@ impl ImageGenerationItem {
             status: self.status.clone(),
             revised_prompt: self.revised_prompt.clone(),
             result: self.result.clone(),
+            saved_path: self.saved_path.clone(),
         })
     }
 }