[core] Skip PlatformIO's private-package authorization probe (#18823)

tests/unit_tests/test_platformio_library.py

@@ -7,6 +7,7 @@ exercised in their own test modules)."""
 import json
 import logging
 from pathlib import Path
+from unittest.mock import Mock
 
 import pytest
 
@@ -228,6 +229,24 @@ def test_resolve_registry_version_raises_without_pkg_file(monkeypatch):
         _resolve_registry_version("owner", "pkg", set())
 
 
+def test_make_registry_client_skips_private_package_probe(monkeypatch):
+    """Our client answers the probe locally without patching PlatformIO's class."""
+    from platformio.account.client import AccountClient
+    from platformio.registry.client import RegistryClient
+
+    pio_probe = RegistryClient.__dict__["allowed_private_packages"]
+    monkeypatch.setattr(
+        AccountClient,
+        "get_account_info",
+        Mock(side_effect=AssertionError("account probe must not run")),
+    )
+
+    client = lib._make_registry_client().get_registry_client_instance()
+
+    assert client.allowed_private_packages() is False
+    assert RegistryClient.__dict__["allowed_private_packages"] is pio_probe
+
+
 def _patch_registry_resolve(monkeypatch: pytest.MonkeyPatch) -> None:
     """Stub the registry lookup so tests never touch the network."""
     monkeypatch.setattr(