eval_job: add shard mode (--fixtures/--shard-id) for sharded submission eval

dockerfile: bump cadgenbench pin a5fd96c -> 289a2fc (baseline package command)

dockerfile: bump cadgenbench pin 679abc1 -> a5fd96c (compare-llms hang fix)

dockerfile: bump cadgenbench pin f90bbc5 -> 679abc1

upload per-fixture iso render for the leaderboard gallery

dockerfile: pin cadgenbench to f90bbc5 (render-pool hang fix); deterministic rebuild

dockerfile: build cadgenbench from main with commit-endpoint cache-bust

readme: explicit paused image-only Space framing

dockerfile: bootstrap pip for python 3.12 via ensurepip

initial commit: Dockerfile + eval_job.py + README

initial commit