- Enumerate all matching windows, let user pick the largest one if multiple.
- Try PrintWindow first (works with GPU-accelerated apps like TradeStation
that render blank under plain mss capture).
- Detect blank/uniform captures and fall back to mss automatically.
- Save captured frame to logs/calibrate_capture_<ts>.png for debugging.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
