test(tasks): a hand-off in the fixtures says what start_task now says

The Bot's reply after start_task is now "On it. I'll put the result in
Tasks.", and the card test already reads it. The ordering test's
fixture says the same, so no test still speaks the old line.

Author: jerelvelarde

app/tests/task-groups.test.ts

@@ -321,7 +321,11 @@ test("a started task's card goes under the Bot's words in its turn, before the p
       ],
     },
     { id: "r1", role: "tool", toolCallId: "call-1", content: "{}" },
-    { id: "a2", role: "assistant", content: "On it." },
+    {
+      id: "a2",
+      role: "assistant",
+      content: "On it. I'll put the result in Tasks.",
+    },
     { id: "u2", role: "user", content: "Thanks" },
   ];
   expect(