Gate live-wire tests behind live marker, skip by default

``tests/test_requests.py`` connects to a real TWS / IB Gateway on
``127.0.0.1:7497`` to exercise the request error path and the
account-summary flow. Running it by default in ``make test`` is both
dangerous (real ``whatIfOrder`` against whatever account the local
gateway is logged into) and useless (every CI runner and any dev
without TWS hits ``ConnectionRefusedError``).

Add the standard pytest opt-in pattern:

* ``[tool.pytest.ini_options]`` registers the ``live`` marker and
  sets ``addopts = "-m 'not live'"`` so the default ``pytest``
  invocation deselects the live tests.
* ``tests/test_requests.py`` carries ``pytest.mark.live`` (alongside
  the existing ``pytest.mark.asyncio``).
* To run the live tests against a connected TWS / Gateway:
  ``pytest -m live`` (or ``pytest -m 'live or not live'`` for both).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mattsta

pyproject.toml

@@ -110,7 +110,16 @@ check_untyped_defs = true
 
 
 [tool.pytest.ini_options]
-asyncio_mode="auto"
+asyncio_mode = "auto"
+# ``live`` tests require a running TWS / IB Gateway on
+# 127.0.0.1:7497. They are dangerous (real orders) and useless (no
+# server) by default, so the default ``addopts`` deselects them.
+# Opt in with ``pytest -m live`` or ``pytest -m 'live or not live'``
+# to include them.
+addopts = "-m 'not live'"
+markers = [
+    "live: requires a running TWS / IB Gateway on 127.0.0.1:7497 (deselected by default)",
+]
 
 
 [build-system]

tests/test_requests.py

@@ -2,7 +2,9 @@
 
 import ib_async as ibi
 
-pytestmark = pytest.mark.asyncio
+# Live: requires a running TWS / IB Gateway on 127.0.0.1:7497.
+# Skipped by default. Opt in with ``pytest -m live``.
+pytestmark = [pytest.mark.asyncio, pytest.mark.live]
 
 
 async def test_request_error_raised(ib):