fix(copilot): restore OAuth exchange + surface LLM failure detail#1159

Aaronontheweb merged 3 commits into

netclaw-dev:devnetclaw-dev/netclaw:devfrom

Aaronontheweb:claude-wt-github-copilot-oauth-handoffAaronontheweb/netclaw:claude-wt-github-copilot-oauth-handoffCopy head branch name to clipboard