(new): rich message support

(fix): runtime reliability
(tests): regression coverage
(doc): v1.1 release notes

bot_opts_loader_test.go

@@ -82,6 +82,25 @@ func TestLoadBotOptsFileExpandsEnvPlaceholders(t *testing.T) {
 	}
 }
 
+func TestLoadBotOptsFileEscapesEnvironmentValuesForJSON(t *testing.T) {
+	want := "quote: \"; slash: \\; newline:\n; tab:\t; control:\x01"
+	t.Setenv("TG_TOKEN", want)
+
+	dir := t.TempDir()
+	filename := filepath.Join(dir, "config.json")
+	if err := os.WriteFile(filename, []byte(`{"token":"{{TG_TOKEN}}"}`), 0o644); err != nil {
+		t.Fatalf("WriteFile returned error: %v", err)
+	}
+
+	got, err := LoadBotOptsFile(BotOptsFileJSONCodec{}, filename)
+	if err != nil {
+		t.Fatalf("LoadBotOptsFile returned error: %v", err)
+	}
+	if got.Token != want {
+		t.Fatalf("unexpected token: got %q want %q", got.Token, want)
+	}
+}
+
 func TestLoadBotOptsFileReturnsDecodeError(t *testing.T) {
 	dir := t.TempDir()
 	filename := filepath.Join(dir, "config.json")