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A digest pin was emitted as `name:sha256:...`, which no registry accepts:
image_source('ghcr.io/.../csp-checker', 'sha256:d559...') returned
'ghcr.io/.../csp-checker:3.0.0'. The separator depends on the pin class, so
the class has to be decided before the reference is built.
utils/docker/image/pin.py names the three classes in preference order
(semver, then digest, then a general ref that no registry can order) and
maps each to the nocheck marker that declares it. Both discovery entry
points now end in pull_reference(), so '@' versus ':' is decided in one
place instead of at every call site.
The semver pin lint points a digest at 'docker-digest' instead of
'docker-version', so the two fallbacks stay distinguishable in the
suppression catalog. It stays warn-only.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>