The digest was dropped and the tag's current digest returned, so 'is this digest still served' got a false yes
(measured: redis:7-alpine@sha256:000…0 resolved to the tag's digest; now HTTP 404). A malformed digest is refused
without a request. test_image_digest.py (no network); red-proof: the pre-fix resolver fails 3 of 4 cases.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
