Developer creates Layer, a CLI tool that leverages Git's built-in exclude file to manage personal project files without cluttering shared .gitignore

Layer manages .git/info/exclude to keep local-only files like API_SPEC.md, BACKEND_GUIDE.md, and prompt files off the shared gitignore

Solves team repository problem where developers maintain personal notes and documentation files that shouldn't be committed but are useful locally

Provides simple CLI commands (layer add, layer status) to manage local file exclusions without touching the shared .gitignore

Prevents .gitignore bloat by handling developer-specific files locally, keeping the shared configuration clean for all team members