// =============================================================================
// Copyright (c) 2025 - 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Feature-aware expansion boundary for generated JSON field redaction.
/// Expands required json support when the runtime feature is enabled.
/// Reports an explicit compile error for required json support in a minimal
/// runtime.