Agent Skills: code-refactoring

Expert refactoring orchestrator for large-scale code changes with change tracking. Use when (1) renaming/moving files or directories, (2) restructuring database schemas, (3) refactoring APIs or Edge Functions, (4) splitting/merging components, (5) querying what changed in a system, (6) migrating IdeaMachina evolution store from Zustand to Supabase, (7) refactoring IdeaMachina components or data layer. Maintains changelog for docs-updater sync.