Nodes checked out v1 code but pulled :latest/:stable images built from main. Each image is now tagged src-<git tree hash of its build directory>: CI adds that tag in every build-*.yml, and scripts/image-tags.sh computes the same value on the node and writes it into .env as DRB_TAG_*, which docker-compose.yml uses (falls back to :latest/:stable for local dev). Tree hashes stay exact even though each image only rebuilds when its own directory changes. - install.sh pins after checkout and fails loudly if a pinned image is missing (compose pull only warns for services with a build: section). - drb-update.sh pulls the target commit's pinned images BEFORE checkout, using the target's own compose file, so a missing image changes nothing (uvicorn --reload would otherwise run new code on old images). It then checks out, writes the pins, recreates, and removes superseded src- tags. - New "Release images" workflow (v* tags + manual dispatch) builds any src- image a release ref is missing; it skips ones already published. The live v1 tag is not moved. Refs #19 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>