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>

tests/AcDream.App.Tests/UI/Layout/CharacterCreationLiveDatTests.cs

@@ -709,7 +709,16 @@ public sealed class CharacterCreationLiveDatTests
             Assert.True(
                 spin.TrySetRetailState(UiButtonStateMachine.Highlight),
                 $"spin 0x{spinId:X8} must accept a Highlight state request.");
-            Assert.Equal("Normal", spin.ActiveState);
+            // #416 media-rule port: the spins DO author a property-only
+            // Highlight StateDesc (the 0x1B/0x21 label style below), and
+            // retail's UIElement::SetState @0x00464E70 COMMITS any authored
+            // state — m_state becomes 6 — while the ARROW ART stays on
+            // Normal through the SetState media rule (@0x004651c0: an
+            // empty-media state never replaces the playing media). The old
+            // "Normal" pin here encoded the pre-port media-keyed gate that
+            // refused the commit outright; the state now commits and only
+            // the art no-ops, which is the exact retail split.
+            Assert.Equal("Highlight", spin.ActiveState);
 
             // AP-222 CORRECTED + RESOLVED (Campaign CC gate round 1 Batch B):
             // the art half of the "no-op" stays a genuine no-op (ActiveState