fix: finish progressive Target detection

internal/dockerclient/dockerclient_test.go

@@ -20,6 +20,19 @@ import (
 	"proxyctl/internal/target/targettest"
 )
 
+func TestDetectClassifiesMalformedClientConfigurationAsFailure(t *testing.T) {
+	a := newAdapter(t, nil)
+	writeConfig(t, a.ConfigPath(), `{"proxies":[]}`)
+
+	detection := a.Detect(context.Background(), activeProfile())
+	if detection.Err == nil || detection.Inspection.State != target.Disabled {
+		t.Fatalf("detection = %#v, want failed Disabled inspection", detection)
+	}
+	if got := a.Inspect(context.Background(), activeProfile()); got.State != target.Disabled {
+		t.Fatalf("maintenance inspection = %#v, want established Disabled semantics", got)
+	}
+}
+
 func TestAvailabilityAndDescriptionDescribeOnlyDockerClientDefaults(t *testing.T) {
 	a := newAdapter(t, nil)
 	availability := a.Availability(context.Background())