tests/custom-html-tiny/install_steps.sh seeds content into the volume pre-deploy. Proof: install
FAILS without the hook (404, graceful-generic), PASSES with it. Same run shows backup/restore=skip
(custom-html-tiny non-backup-capable) — DG3 N/A-skip. deploy-count=1. recipe_meta shortens timeouts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>