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Step 3 of milestone #128. Presentation-tagged images cluster on UI chrome rather than content, so near any one of them they fill the whole more-like-this grid. Excluded from candidates in the ONE whole-image similarity surface (gallery similar mode, explore walk, and RelatedStrip all ride GalleryService.similar) — the anchor itself may be a banner, and wip stays surfaced: only the training pipelines exclude it. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM