fix(tests): align subscribe audit test with warn-and-continue behavior

subscribe.py catches audit write failures and warns instead of failing.
Update the test to assert returncode 0, the warning message on stderr,
and that the clone is preserved.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: visahak

tests/platform_integrations/test_subscribe.py

@@ -194,8 +194,8 @@ def test_rolls_back_clone_if_config_write_fails(self, temp_project_dir, local_re
         assert not dest.exists(), "Clone should be rolled back when config write fails"
 
     @pytest.mark.skipif(_IS_WINDOWS, reason="chmod not supported on Windows")
-    def test_rolls_back_clone_if_audit_write_fails(self, temp_project_dir, local_repo):
-        """If audit_append raises after a successful clone + config write, the clone is removed."""
+    def test_warns_when_audit_write_fails(self, temp_project_dir, local_repo):
+        """If audit_append raises after a successful clone, subscribe still succeeds with a warning."""
         evolve_dir = temp_project_dir / ".evolve"
         evolve_dir.mkdir(parents=True)
         # Pre-create a read-only audit.log so audit_append raises PermissionError
@@ -212,10 +212,10 @@ def test_rolls_back_clone_if_audit_write_fails(self, temp_project_dir, local_rep
             )
         finally:
             audit_log.chmod(0o644)
-        assert result.returncode != 0
-        assert "failed to record subscription" in result.stderr
+        assert result.returncode == 0
+        assert "Warning: audit log could not be updated" in result.stderr
         dest = evolve_dir / "entities" / "subscribed" / "alice"
-        assert not dest.exists(), "Clone should be rolled back when audit write fails"
+        assert dest.exists(), "Clone should be kept even when audit write fails"
 
 
 class TestUnsubscribe: