fix #416 #415: the retail button state/media machine — roster hover highlight clears; probe wait verbs bind without an artifact dir

#416 (char-select roster highlight never cleared on hover-leave): three
decomp-grounded mechanisms replace the media-keyed _availableStates
approximation.
- UIElement_Button::UpdateState_ @0x00471CF0: the button machine commits
  ONLY states authored on the button's OWN ElementDesc (AccessStateDesc
  gate); unauthored requests no-op, preserving custom semantic states.
- UIElement::SetState @0x00464E70: an unauthored state id is coerced to
  state 0 (the unnamed base state) and committed — ported into
  UiDatElement.TrySetRetailState with the base-descriptor PassToChildren
  cascade arm.
- The SetState media rule @0x004651c0: a committed state replaces the
  playing media ONLY when its media array is non-empty. UiButton now keeps
  per-face-segment media states under that rule (segments model retail's
  PassToChildren children), and LayoutImporter records the raw MediaCount
  including the File=0 draw-nothing images the drawable filter drops —
  the roster bar children's base state is exactly such an image, and it is
  what clears the bar.
The row template truth (probe, installed DAT): the row authors EMPTY
Normal/rollover/Highlight descriptors with PassToChildren; the three bar
children author rollover/Highlight media, NO Normal state, and a File=0
base image. An empty-media Normal_pressed still never blanks a Normal-art
button (the media rule keeps the previous art — the exact behavior the
old gate approximated), and the Appearance spins' property-only Highlight
now genuinely commits: label recolors, arrow art lingers — the retail
split AP-222 approximated with a requested-keyed label hack, now retired.
Live-verified at char select: hover +alex shows the grey bar, moving off
clears it, the selected row keeps its amber bar.

#415 (probe wait world-* verbs dead): the filed snapshot-reset diagnosis
was wrong — the automation bridge simply never bound without
ACDREAM_AUTOMATION_ARTIFACT_DIR. A facts-only
WorldRevealFactsAutomationRuntime now binds whenever the retained UI
exists; checkpoint/screenshot verbs still require the artifact directory
and now report that instead of a generic timeout.

App tests 5568/3 skips, Runtime 1756/0, UI.Abstractions 926/0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Composition/FrameRootComposition.cs

@@ -524,6 +524,22 @@ internal sealed class FrameRootCompositionPhase
                 interaction.LateBindings.Automation.Bind(
                     lifecycleAutomation));
         }
+        else if (interaction.RetainedUi is not null)
+        {
+            // #415: without ACDREAM_AUTOMATION_ARTIFACT_DIR the deferred
+            // automation wrapper stayed unbound, so a probe script's
+            // `wait world-ready/world-visible/materialized` verbs read
+            // false forever and timed out even while the world revealed.
+            // The wait verbs need only the reveal facts — bind them always;
+            // checkpoint/screenshot verbs keep requiring the artifact
+            // directory and now report that instead of a generic timeout.
+            bindings.Adopt(
+                "world reveal facts automation binding",
+                interaction.LateBindings.Automation.Bind(
+                    new WorldRevealFactsAutomationRuntime(
+                        () => session.WorldReveal.Snapshot,
+                        () => session.WorldReveal.PortalMaterializationCount)));
+        }
         Fault(FrameRootCompositionPoint.LifecycleAutomationBound);
 
         IRetainedGameplayUiFrame? retainedGameplayUi =