image-edit: change one thing in a picture you already have

One image in, one edited image out. The craft here is not describing a picture — the picture already exists — it is saying what changes and what must not, and then checking that the file you got back honoured the second half.

This skill is a thin, scenario-specific layer over ofox-image-core. It owns the edit instruction's wording, the question set, the recommended defaults and the before-and-after check; ofox-image-core owns talking to the Ofox image API correctly and safely — the OFOX_API_KEY handling, the model resolution, the multipart request, the decode-and-save, the cost arithmetic, and reporting an absolute path. Read that skill's safety contract before using this one — it is not restated here.