lifecycle.prepull_images(recipe, domain): resolve images via docker compose config --images (COMPOSE_FILE
from the app .env — handles $VERSION interpolation + multi-compose) → docker pull each, skip-if-present
(zero network for cached pinned tags). Called in deploy_app before the (unchanged, real) abra.deploy AND
in generic.perform_upgrade before the chaos redeploy (warms new-version images). A pull failure RAISES a
clear pre-deploy error (not a converge timeout); deploy path unchanged (no docker service update/scale).
Removes PULL time not app-INIT time. 4 unit tests (tests/unit/test_prepull.py): present→skip, missing→
pull, pull-fail→raise, no-images→skip. NOT claimed yet — validating cold-verify criteria next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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