Scenario F of the guarded-update live validation, the same way the 2026-09-01 spike did it: the new
"version" is an image that starts and exits immediately, so the app never becomes healthy and must be
HELD — and then restored from its named copy. catalog_since moves with the image line; the revert
restores it.
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
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