Add opportunity dataset collection

tests/test_cli.py

@@ -248,3 +248,32 @@ class CLITestCase(unittest.TestCase):
         content = __import__("pathlib").Path(tmp_path).read_text()
         self.assertIn("BINANCE_API_SECRET=test_secret_value", content)
         __import__("os").unlink(tmp_path)
+
+    def test_opportunity_dataset_dispatches_without_private_client(self):
+        captured = {}
+        config = {"market": {"default_quote": "USDT"}, "opportunity": {}}
+        with (
+            patch.object(cli, "load_config", return_value=config),
+            patch.object(cli, "_load_spot_client", side_effect=AssertionError("dataset should use public data")),
+            patch.object(
+                cli.opportunity_dataset_service,
+                "collect_opportunity_dataset",
+                return_value={"path": "/tmp/dataset.json", "symbols": ["BTCUSDT"]},
+            ) as collect_mock,
+            patch.object(
+                cli, "print_output", side_effect=lambda payload, **kwargs: captured.setdefault("payload", payload)
+            ),
+        ):
+            result = cli.main(
+                ["opportunity", "dataset", "--symbols", "BTCUSDT", "--simulate-days", "3", "--run-days", "7"]
+            )
+
+        self.assertEqual(result, 0)
+        self.assertEqual(captured["payload"]["path"], "/tmp/dataset.json")
+        collect_mock.assert_called_once_with(
+            config,
+            symbols=["BTCUSDT"],
+            simulate_days=3.0,
+            run_days=7.0,
+            output_path=None,
+        )