New Windows-native capabilities:
- windowCapture.ts: PrintWindow API for per-window screenshot (works on
occluded/background windows)
- windowEnum.ts: EnumWindows for precise window enumeration with HWND
- uiAutomation.ts: IUIAutomation for UI tree reading, element clicking,
text input, and coordinate-based element identification
- ocr.ts: Windows.Media.Ocr for screen text recognition (en-US + zh-CN)
Updated win32.ts backend to use EnumWindows for listRunning() and added
captureWindowTarget() for window-specific screenshots.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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