List all modules that depend on a given module (reverse dependency lookup).

Use this tool when:

• Understanding the impact of changing a module
• Planning deprecation of a module or API
• Finding all consumers of a shared utility module
• Assessing risk before refactoring

Examples:

• Find all modules that use a shared helper before modifying it
• Identify consumers of a library module before making breaking changes
• Understand how widely used a module is in the codebase

Returns: List of modules that depend on the target module, with dependency types.