message: fix(config): ensure config type reflects get<T>
diff: @@ -34,8 +34,8 @@ export type Config = {
  keys(): string[];
  - get(key?: string): JsonValue;
  - getOptional(key?: string): JsonValue | undefined;
  + get<T = JsonValue>(key?: string): T;
  + getOptional<T = JsonValue>(key?: string): T | undefined;
  getConfig(key: string): Config;
  getOptionalConfig(key: string): Config | undefined;
  