Add a New Validation Rule and Flag Use this skill when you need to add a new validation rule to the package, expose it as a toggleable CLI flag, and verify its behavior. --- 🛠️ Step-by-Step Implementation 1. Create the Rule Class Create a new file in extending . [!TIP] If your rule expects a specific structure in the skill's YAML frontmatter (e.g., inside ), document this structure clearly in the class Dart docstring. Accessing YAML Frontmatter If your rule needs configuration from the skill's YAML frontmatter, you can access it via . 2. Register the Rule in Add a new instance to list. This…