Problem

The gh copilot command launches the Copilot CLI binary via exec.Command, but does not pass any environment variable or identifier that would allow the copilot process to know it was launched by gh.

This means the copilot process has no way to distinguish whether it was invoked directly by the user or through gh copilot.

Proposed solution

Set a GH_COPILOT=true environment variable on the subprocess before executing it:

externalCmd.Env = append(os.Environ(), "GH_COPILOT=true")