- Fixed simulateError helper to properly handle async error interceptors - Made mock implementation async to handle promise rejections correctly - Enabled all 7 previously skipped error handling tests - All 666 tests now pass without unhandled promise rejections This fixes the CI pipeline failure caused by unhandled promise rejections. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>