ubuntu:24.04 and uv:python3.14-bookworm-slim are pinned to their index digests, which include the exact amd64 images the candidates were built from (rebuilt image IDs are identical) and the arm64 ones. A package test keeps every FROM pinned. Also records the seventh slice in the ledger and corrects the "Find sellers" wait to "up to about 30 seconds". Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>