test: add coverage for monitor/vm/winrm to reach 90%% gate

Bring monitor.py 49->99%%, vm.py 79->98%%, winrm.py 76->100%%. Total project coverage 80.10%% -> 90.69%%, satisfying the 90%% gate set in commit 451a61c.

tests/python/test_winrm_transport.py

@@ -98,3 +98,98 @@ def test_is_ready_handles_connect_failure(monkeypatch: pytest.MonkeyPatch) -> No
     # Direct .run should raise.
     with pytest.raises(TransportConnectError):
         t.run("x")
+
+
+def test_close_and_context_manager(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+    closed: list[bool] = []
+    fake.wsman = types.SimpleNamespace(close=lambda: closed.append(True))
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    with t as ctx:
+        assert ctx is t
+    assert closed == [True]
+    # close() on already-closed transport is a no-op.
+    t.close()
+
+
+def test_close_swallows_wsman_exception(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+    def _raise() -> None:
+        raise RuntimeError("boom")
+    fake.wsman = types.SimpleNamespace(close=_raise)
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    t.run("x")  # connect once
+    t.close()  # must not raise
+
+
+def test_run_normalises_list_stderr(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+    fake.next_result = ("out", ["a", "b"], 0)  # type: ignore[assignment]
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    result = t.run("x")
+    assert result.stderr == "a\nb"
+
+
+def test_run_normalises_non_iterable_stderr(monkeypatch: pytest.MonkeyPatch) -> None:
+    class _Weird:
+        def __str__(self) -> str:
+            return "weird-stderr"
+
+    fake = _FakeClient()
+    fake.next_result = ("out", _Weird(), 0)  # type: ignore[assignment]
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    result = t.run("x")
+    assert "weird-stderr" in result.stderr
+
+
+def test_run_execute_ps_raises_wrapped(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+
+    def _boom(_s: str) -> Any:
+        raise RuntimeError("ps boom")
+
+    fake.execute_ps = _boom  # type: ignore[assignment]
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    with pytest.raises(TransportConnectError) as exc:
+        t.run("x")
+    assert "execute_ps failed" in str(exc.value)
+
+
+def test_copy_wraps_exception(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+
+    def _boom(_l: str, _r: str) -> None:
+        raise OSError("copy down")
+
+    fake.copy = _boom  # type: ignore[assignment]
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    with pytest.raises(TransportConnectError) as exc:
+        t.copy("a", "b")
+    assert "copy failed" in str(exc.value)
+
+
+def test_fetch_wraps_exception(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+
+    def _boom(_r: str, _l: str) -> None:
+        raise OSError("fetch down")
+
+    fake.fetch = _boom  # type: ignore[assignment]
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    with pytest.raises(TransportConnectError) as exc:
+        t.fetch("a", "b")
+    assert "fetch failed" in str(exc.value)
+
+
+def test_is_ready_true_when_run_succeeds(monkeypatch: pytest.MonkeyPatch) -> None:
+    fake = _FakeClient()
+    _install_fake_pypsrp(monkeypatch, fake)
+    t = WinRmTransport("10.0.0.1", "user", "pwd")
+    assert t.is_ready() is True