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Harness leg-1 image preprocess for the J-1 perception gateway. Triggers when the user is about to attach an image to a message, asks to read or analyze a screenshot / diagram / mockup / photo / figure, says "look at this image", "read this screenshot", "analyze this mockup", "check this figure for the fine print", or invokes /see by name. Runs scripts/preprocess.py locally BEFORE the image is attached so the bytes…