A direct read of src/AcDream.App/UI/ found a complete (dormant) retained-mode
toolkit the grounding workflow missed: UiRoot (input routing, focus, capture,
drag-drop, tooltip, click detection, world fall-through), UiElement,
UiPanel/UiLabel/UiButton, UiHost (Tick/Draw + WireMouse/WireKeyboard),
UiRenderContext, retail-faithful UiEvent codes. It's never wired into GameWindow,
and UiPanel.cs is the exact file divergence row TS-30 cites.
So the retail UI is this existing UiRoot tree — NOT an IPanelHost/IPanelRenderer
backend. Rewrote the architecture sections: Spec 1 now WIRES the dormant UiHost
and adds only the gaps (DrawSprite + frag uUseTexture=2, UiNineSlicePanel,
UiMeter, MarkupDocument that builds a UiElement subtree, ControlsIni). Input
machinery already exists in UiRoot; deferring it is now about integrating two
input consumers, not a missing contract. Plugin contract becomes a UiElement/
markup subtree added to UiRoot (IUiRegistry on IPluginHost), not IPanel.
Net: strictly less new code, more faithful, retires TS-30 by subclassing the
file it cites. Added §0 documenting the correction + the process lesson
(subsystem-discovery must glob by directory, not by the parent's framing).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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