openclaw-master-skills は何をしますか？
This skill should be used when the user wants to compress a PowerPoint (.pptx) file by reducing the size of embedded videos and large images. It handles the complete workflow of extracting media from .pptx archives, compressing videos with a bundled ffmpeg (no installation required) and images with Pillow, and repackaging into a valid .pptx file. Trigger phrases include "compress PPT", "reduce PPT size", "compress PowerPoint", "PPT too large", "shrink presentation", "compress videos in PPT", "co