Keeping Your AI Context Files Healthy: A Maintenance Guide for VS Code + Copilot Projects

Most teams that adopt GitHub Copilot in VS Code start by dropping a single copilot-instructions.md into .github/. Six months later, that file is 400 lines long, three agents are duplicating each other, and Copilot is confidently following instructions that haven t been true since a framework migration in Q1. This is a maintenance problem, not an [ ]