test(cli): update size-limit assertion to match new error message

The batch manifest size error now reads "1 MiB limit" instead of the
raw byte count. Update the regex in assertRaisesRegex accordingly so
the test stays green.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Mihir7027

test/services/test_cli.py

@@ -990,7 +990,7 @@ def test_batch_manifest_limits_size_and_task_count(self):
         with tempfile.TemporaryDirectory() as temp_dir:
             oversized = Path(temp_dir) / "oversized.jsonl"
             oversized.write_bytes(b"x" * (cli._BATCH_FILE_MAX_BYTES + 1))
-            with self.assertRaisesRegex(ValueError, "byte limit"):
+            with self.assertRaisesRegex(ValueError, "1 MiB limit"):
                 cli._load_batch_manifest(str(oversized))
 
             too_many = Path(temp_dir) / "too-many.json"