Add reference design images, point task.json at relative paths

README.md

@@ -130,18 +130,30 @@ tasks/<id>/task.json         the task: milestones, checklist, metadata
 tasks/<id>/repo/**           seed project (brownfield tasks only, 11 tasks)
 tasks/<id>/prototypes/repo_state.jpg
                              before screenshot of the seed project (11 tasks)
+tasks/<id>/prototypes/reference.jpg
+                             reference design image (13 tasks)
 ```
 
 ## Reference images
 
-Nine tasks are of `replicate` type and require a reference design image. Those images are
-not redistributed here because their rights have not been cleared for public release.
-Researchers who need them should contact the authors.
+Thirteen tasks depend on a reference design image, stored at
+`tasks/<id>/prototypes/reference.jpg` and referenced from `task.json` by the relative path
+`seed_meta.ref_image_src`. Nine of them are of `replicate` seed type; the other four are
+`prd` tasks that were authored against a reference layout.
+
+These reference images are long screenshots of **real third-party websites**, captured for
+research on design reproduction. They are included so that the tasks can be run as intended,
+but they are **not covered by the MIT license of this repository**: the rights remain with
+the respective site owners, and the images are provided for research and benchmarking only,
+without any permission to reuse them commercially or in derivative works. If you are a
+rights holder and want an image removed, contact the authors and it will be taken down.
 
 ## License
 
-Task definitions, seed projects and screenshots in this repository are released under the
-MIT License.
+Task definitions (`task.json`), seed projects (`repo/**`) and the seed-project screenshots
+(`repo_state.jpg`) are released under the MIT License. The reference design images
+(`reference.jpg`) are third-party material and are excluded from that license, as described
+under *Reference images*.
 
 The seed projects are small Vite + React applications assembled for these tasks and contain
 bundled image assets used as placeholder art.