hive-agent: replace json! with typed structs in web_ui handlers

hive-agent/src/web_ui/stats.rs

@@ -2,7 +2,7 @@
 
 use axum::extract::State;
 use axum::response::{IntoResponse, Response};
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 use super::AppState;
 
@@ -40,6 +40,11 @@ async fn fetch_reminder_stats(window_secs: u64) -> Option<hive_sh4re::approvals:
     }
 }
 
+#[derive(Serialize)]
+struct TodosBody {
+    todos: Vec<hive_sh4re::inbox::LooseEnd>,
+}
+
 /// `GET /api/todos` — snapshot of this agent's local todos (loose-ends v2).
 ///
 /// Connects to the in-agent harness socket (`HIVE_AGENT_SOCKET`) and calls
@@ -54,5 +59,5 @@ pub(super) async fn api_todos() -> Response {
             Some(hive_agent_sock::Response::LooseEnds { loose_ends }) => loose_ends,
             _ => Vec::new(),
         };
-    axum::Json(serde_json::json!({ "todos": todos })).into_response()
+    axum::Json(TodosBody { todos }).into_response()
 }