Wrap status output in code block for visual distinction

Status posts now render inside triple-backtick code blocks
so they look different from normal chat replies.

src/status-formatter.js

@@ -66,7 +66,12 @@ function format(sessionState, opts = {}) {
     lines.push(`${indent}  [${sessionState.status.toUpperCase()}] ${elapsed}${tokenStr}`);
   }
 
-  return lines.join('\n');
+  // Wrap in code block at top level so it looks distinct from normal messages
+  var body = lines.join('\n');
+  if (depth === 0) {
+    body = '```\n' + body + '\n```';
+  }
+  return body;
 }
 
 /**