Replace the 'copilot' fallback string with a RuntimeError so users get a clear message instead of a cryptic auth failure from the API. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Add tradingagents/llm_clients/copilot_client.py with all Copilot auth (gh CLI token, GraphQL URL resolution, required headers) and CopilotClient class inline — no separate auth module needed - Simplify openai_client.py: remove Copilot code, inline codex OAuth token logic directly (was tradingagents/auth/codex_token.py) - Remove tradingagents/auth/ folder entirely - Update factory.py to route 'copilot' -> CopilotClient - Simplify cli/utils.py to delegate to copilot_client helpers Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Jiaxu Liu