Both Dockerfiles already install mold v2.35.1 but the registry images are stale builds without it. This change triggers rebuild-ci-builder and rebuild-ci-builder-cpu pipeline steps via detect-changes. .cargo/config.toml uses -fuse-ld=mold — without mold in the image, linking falls back to the system default (slower). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>