feat: detached review (#7292)

codex-rs/protocol/src/protocol.rs

@@ -1256,13 +1256,18 @@ pub struct GitInfo {
     pub repository_url: Option<String>,
 }
 
+#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS)]
+#[serde(rename_all = "snake_case")]
+pub enum ReviewDelivery {
+    Inline,
+    Detached,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
 /// Review request sent to the review session.
 pub struct ReviewRequest {
     pub prompt: String,
     pub user_facing_hint: String,
-    #[serde(default)]
-    pub append_to_original_thread: bool,
 }
 
 /// Structured review result produced by a child review session.