- docs/design/226-catalog-gallery/README.md — 12 changed files, DisplayCategory enum, sealed CatalogItem, 5 scenarios - docs/design/226-catalog-gallery/fn-catalog_repository.md — 3-source unification algorithm + helpers - docs/design/226-catalog-gallery/fn-migration_v1_to_v2.md — first schema migration (DROP + reseed pattern) - docs/adr/0004-catalog-recategorization-and-first-migration.md — Catalog 재분류 + 첫 마이그레이션 정책 Refs #226