Civitai's post.addImage resolves the image's Tools field from a lowercase
`engine` detail key (getToolByAlias/getToolByName), and a Tool named
"ComfyUI" exists, so emitting `engine: ComfyUI` in the A1111 parameters
line makes every saved image auto-tag as ComfyUI on upload.
The key is written before `additional_data` so a user-supplied `engine:`
still wins (duplicate detail keys are last-one-wins). Techniques are
deliberately not written: `process`/`type`/`workflow` cannot be derived
reliably from the graph, and a wrong value is user-visible on Civitai.