The VS Code Copilot Chat extension writes MCP socket-handoff lock files
into ~/.copilot/ide/ on launch, so `existsSync(~/.copilot)` reported the
Copilot CLI as installed on any machine that merely has the VS Code
extension (caught live on the maintainer's Mac). Detection now counts
the dir as a CLI footprint only when it holds something besides `ide`.
Also: uninstalling a from-scratch install now deletes mcp-config.json
instead of leaving a `{}` husk that would keep detect() reporting the
CLI as installed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>