fix: clarify _is_valid_host_pattern docstring, clean up test sentinel type

Agent-Logs-Url: https://github.com/github/spec-kit/sessions/889b58a7-7f8c-47e2-8056-931ebcc671cc

Co-authored-by: mnriem <15701806+mnriem@users.noreply.github.com>

Author: Copilot

src/specify_cli/authentication/config.py

@@ -44,7 +44,9 @@ def _is_valid_host_pattern(pattern: str) -> bool:
     forms are accepted:
 
     * ``example.com``         — exact hostname
-    * ``*.example.com``       — single leading wildcard for one sub-domain level
+    * ``*.example.com``       — leading ``*.`` wildcard (matches any sub-domain
+      depth under the suffix, e.g. ``myorg.visualstudio.com`` or
+      ``sub.myorg.visualstudio.com``)
     """
     if "*" not in pattern:
         return True  # exact hostname — already validated as non-empty

tests/test_authentication.py

@@ -715,7 +715,7 @@ def fake_load(path=None):
     def test_cache_bypassed_by_override(self, monkeypatch):
         """When _config_override is set, the cache is ignored entirely."""
         from specify_cli.authentication import http as _mod
-        sentinel: list = [object()]  # type: ignore[list-item]
+        sentinel = [_github_entry()]
         monkeypatch.setattr(_mod, "_config_override", sentinel)
         monkeypatch.setattr(_mod, "_config_cache", None)