test(contract): keep the mode-000 read checks POSIX-only (#6007)

Author: JasonBuildAI

tests/control_plane/test_agent_preferences.py

@@ -248,8 +248,8 @@ def dispatch():
 @pytest.mark.parametrize("denied_target", ["journal", "namespace"])
 def test_permission_denied_hook_is_not_empty_and_recovers(tmp_path, denied_target):
     import os
-    if os.geteuid() == 0:
-        pytest.skip("root bypasses POSIX read permission")
+    if os.name == "nt" or os.geteuid() == 0:
+        pytest.skip("mode 000 read denial needs a non-root POSIX host")
     _, runtime, registry = _write_fixture(tmp_path, required_capability="network")
     scope = ("--goal-id", GOAL_ID, "--agent-id", AGENT_ID)
     rc, written = _run_cli(registry, runtime, "semantic-preference", "agent", "remember", *scope,

tests/test_contract_scan_unreadable_files.py

@@ -67,7 +67,10 @@ def fail_git_probe(_: Path) -> dict[str, object]:
     assert payload["scanned_files"] == 1
 
 
-@pytest.mark.skipif(os.geteuid() == 0, reason="root reads mode 000 files")
+@pytest.mark.skipif(
+    os.name == "nt" or os.geteuid() == 0,
+    reason="mode 000 read denial needs a non-root POSIX host",
+)
 def test_scan_public_boundary_reports_unreadable_file(tmp_path: Path) -> None:
     (tmp_path / "ok.md").write_text("hello\n", encoding="utf-8")
     locked = tmp_path / "locked.md"