preserve thinking delta whitespace in runlog streaming

server/src/__tests__/cursor-local-adapter.test.ts

@@ -164,6 +164,17 @@ describe("cursor ui stdout parser", () => {
       ),
     ).toEqual([{ kind: "thinking", ts, text: "planning next command", delta: true }]);
 
+    expect(
+      parseCursorStdoutLine(
+        JSON.stringify({
+          type: "thinking",
+          subtype: "delta",
+          text: " with preserved leading space",
+        }),
+        ts,
+      ),
+    ).toEqual([{ kind: "thinking", ts, text: " with preserved leading space", delta: true }]);
+
     expect(
       parseCursorStdoutLine(
         JSON.stringify({