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LayoutStore.cs 1402 -> 47-line shell + 5 partials, grouped by functionality (line count is a consequence, not the goal): - LayoutStore.Migrations.cs: all DB schema migration (EnsureSchema, GetUserVersion, MigrateSourceTable/WebcamConfigTable/ToV3/SceneTable/SceneSocialBarColumn/ SocialsTable/SocialEntryTable) - LayoutStore.Load.cs: Load() scene/source read-back - LayoutStore.Save.cs: Save() full scene tree write - LayoutStore.Settings.cs: key/value settings + mic/record-folder/reusable-stream + license/transition/broadcast/hotkey/window-state GetSetting/UpsertSetting - LayoutStore.Assets.cs: GetAssetBytes/UpsertAsset blob IO - LayoutStore.cs: shell — Instance, fields, ctor, Dispose Converted to public partial class LayoutStore : IDisposable. Pruned per-file dead usings. Phase 3 DOWN: no production .cs exceeds 500 lines. Zero behavior change; build 0 warnings; 246 pass, only the 2 known failures. Docs: ViewModels/index.md Phase 3 tracker updated in same commit.