deploy: bump cadgenbench to b76a55a + ship metrics assets

Pins the Space to cadgenbench b76a55a (report title with submission
name, click-to-zoom images, metric pill deep-links) and copies the new
assets/ dir into the image so the Metrics page's mating-group WebP is
served by the /metrics-assets route.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

@@ -41,7 +41,7 @@ RUN pip install --no-cache-dir -r /tmp/requirements.txt \
 # image rebuild picks up the latest code (pre-v1: always-updated). Lock
 # to a specific commit SHA at the v1 release so published scores are
 # reproducible (see space-setup/post-gt-swap.md Stage F).
-ARG CADGENBENCH_SHA=72f6e82
+ARG CADGENBENCH_SHA=b76a55a
 # Cache-bust the install below whenever the tracked ref moves: the
 # GitHub commits endpoint's response changes with each new commit on
 # `main`, so BuildKit re-fetches and invalidates the cached pip layer.
@@ -70,6 +70,10 @@ RUN useradd -m -u 1000 user \
 USER user
 WORKDIR /home/user/app
 COPY --chown=user:user *.py ./
+# Static illustration assets the Metrics page serves (e.g. the interface
+# mating-group WebP). `*.py` above doesn't sweep these in, so copy the dir
+# explicitly or the /metrics-assets route 404s on the deployed Space.
+COPY --chown=user:user assets ./assets
 
 EXPOSE 7860
 CMD ["python", "app.py"]