Retire unused weather bundle persistence helpers

internal/adapters/weatherapi/client_test.go

@@ -1055,27 +1055,6 @@ func TestHTTPTimeout(t *testing.T) {
 	}
 }
 
-func TestSaveBundle(t *testing.T) {
-	server := fixtureServer(t, nil, nil)
-	client := newTestClient(t, server.URL+"/", nil)
-	bundle, err := client.FetchBundle(context.Background())
-	if err != nil {
-		t.Fatalf("FetchBundle() error = %v", err)
-	}
-
-	path := filepath.Join(t.TempDir(), "nested", "bundle.json")
-	if err := SaveBundle(path, bundle); err != nil {
-		t.Fatalf("SaveBundle() error = %v", err)
-	}
-	data, err := os.ReadFile(path)
-	if err != nil {
-		t.Fatalf("read saved bundle: %v", err)
-	}
-	if !strings.Contains(string(data), `"hourly"`) {
-		t.Fatalf("saved bundle missing hourly source:\n%s", string(data))
-	}
-}
-
 type handlerOverride struct {
 	status  int
 	body    string