Consider adding github copilot cli as executor

[MarkEdmondson1234]

https://github.com/features/copilot/cli

[sunholo-voight-kampff]

🤖 Agent Working

I've picked up this issue and am working on it.

Field	Value
Task ID	task-ff454dbd
Agent	AILANG Coordinator
Stage	Design Document
Status	In Progress

You'll receive updates as I make progress.