b27eaaa4db
- Use isinstance() with try/except import for CopilotACPClient check in _to_async_client instead of fragile __class__.__name__ string check - Restore accurate comment: GPT-5.x models *require* (not 'often require') the Responses API on OpenAI/OpenRouter; ACP is the exception, not a softening of the requirement - Add inline comment explaining the ACP exclusion rationale