fix: sanitize node invoke result params

src/node-host/runner.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, test } from "vitest";
+
+import { buildNodeInvokeResultParams } from "./runner.js";
+
+describe("buildNodeInvokeResultParams", () => {
+  test("omits optional fields when null/undefined", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-1", nodeId: "node-1", command: "system.run" },
+      { ok: true, payloadJSON: null, error: null },
+    );
+
+    expect(params).toEqual({ id: "invoke-1", nodeId: "node-1", ok: true });
+    expect("payloadJSON" in params).toBe(false);
+    expect("error" in params).toBe(false);
+  });
+
+  test("includes payloadJSON when provided", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-2", nodeId: "node-2", command: "system.run" },
+      { ok: true, payloadJSON: '{"ok":true}' },
+    );
+
+    expect(params.payloadJSON).toBe('{"ok":true}');
+  });
+
+  test("includes payload when provided", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-3", nodeId: "node-3", command: "system.run" },
+      { ok: false, payload: { reason: "bad" } },
+    );
+
+    expect(params.payload).toEqual({ reason: "bad" });
+  });
+});