fix: complete target diagnostics and reset inspection

internal/apt/apt_test.go

@@ -46,6 +46,30 @@ func TestAvailabilityRequiresDebianMarkerAPTToolAndConfigurationDirectory(t *tes
 	}
 }
 
+func TestDiagnosticChecksCoverCommandSchemaAndAuthorityWithoutMutation(t *testing.T) {
+	a, _ := newAdapter(t, nil)
+	checks := a.DiagnosticChecks(context.Background(), compatibleProfile())
+	assertDiagnosticNames(t, checks, "required command", "configuration schema", "write authority")
+	if _, err := os.Stat(a.OverlayPath()); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("diagnostics created APT overlay: %v", err)
+	}
+}
+
+func assertDiagnosticNames(t *testing.T, checks []target.Check, names ...string) {
+	t.Helper()
+	for _, name := range names {
+		found := false
+		for _, check := range checks {
+			if check.Name == name {
+				found = true
+			}
+		}
+		if !found {
+			t.Errorf("diagnostics missing %q: %#v", name, checks)
+		}
+	}
+}
+
 func TestDescriptionExplainsEnvironmentPersistenceAndPrivilegeBoundary(t *testing.T) {
 	a, _ := newAdapter(t, nil)
 	got := a.Description()