First step of Sub-phase B (inventory window). Dumped LayoutDesc 0x21000023:
the three nested panels (paperdoll/backpack/3D-items) are Type-0 pure-
container leaves that nest via the EXISTING BaseElement+BaseLayoutId
inheritance path (BaseLayoutId → 0x21000024/22/21), NOT game-class Types as
the research agent claimed. ElementReader.Merge drops base children, so they
import empty today. Mount = a surgical ~4-line LayoutImporter.Resolve change:
a childless, media-less inheritor attaches its base's resolved subtree
(predicate ShouldMountBaseChildren, unit-testable; inert for media-bearing
inheritors + childless style prototypes, so vitals/chat/toolbar are
unaffected). Plus UiItemList N-cell grid mode (single-cell toolbar preserved).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
