chore: remove unused ImageNormalizer::read plumbing

[detail-app]

Remove the read method from the ImageNormalizer trait and its
implementations (DisabledNormalizer, DefaultImageNormalizer), along
with the cascading ImageStore::read trait method and its three backend
impls (MemoryStore, GcsStore, S3CompatStore) and the two tests
that exercised them.

The read method had no production callers anywhere in the workspace.
Its trait doc comment claimed it was "Used by the dashboard image
endpoint (after authorisation)", but the dashboard endpoint
(GET /admin/api/v1/images/:sha256 in api/handlers/images.rs) uses
sign + a 302 redirect to a short-lived signed URL, deliberately
keeping dwctl off the bytes egress path. The comment actively misleads.
Removing the trait method also made the ImageStore::read impls dead
as a cascade (their only production consumer was
DefaultImageNormalizer::read).

History

• Last materially changed June 2026 (feat: image input normalisation #1083 @pjb157)

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