refactor: extract persona tool tests to separate file

Author: gahyun-git

src/tools/persona/tests.rs

@@ -0,0 +1,7 @@
+use super::*;
+
+#[test]
+fn test_persona_tool_name() {
+    let tool = PersonaTool::new();
+    assert_eq!(tool.definition().name, "persona_info");
+}