indexion refactor — Codebase Refactoring

Detect and eliminate duplication at three levels — textual, structural, and conceptual — using indexion's analysis commands, then verify SoT is enforced.

When to Use

• After adding a new abstraction (type, module, API layer)
• After introducing a new file format or I/O boundary
• When a fix required touching 3+ files for the same reason
• When a "guard" or "skip" was added to work around a structural problem
• When opendir, ENOENT, or similar filesystem errors appear from unexpected paths
• When extracting shared code across packages
• When cleaning up after a refactor (removing trivial wrapper functions)
• Periodic SoT health check on a codebase

Three Levels of Duplication