c36 told the agent not to translate into Chinese; in an English task that
should read English. c42-c45 carried a ref_image_src entry and a screenshot
that belonged to no part of the task; both are removed, so nine tasks now
reference a design image, all of them replicate tasks.
Requirements, checklist items, dimensions, operators, difficulty, domains and levers are now English. Structural ids, item indices, weights and reference-image paths are unchanged.
Add reference design images, point task.json at relative paths
