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drawElementImage: pixel-perfect capture via html-in-canvas API using <canvas layoutsubtree> with iframe child. Achieves 42 dB PSNR vs 30 dB for SnapDOM. Requires Chrome --enable-blink-features=CanvasDrawElement. Tab-capture: experimental getDisplayMedia-based capture. Also adds regression parity scripts for compiling test compositions and comparing PSNR against golden reference renders. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>