feat(ui): D.2b item interaction + retail cursors + live character sheet

Lands the codex-worktree D.2b stream plus the extraction the 2026-07-02
UI architecture review mandated before commit:

- ItemInteractionController: single owner of double-click use/equip/
  container-open, targeted-use mode (health kits), drag-out drop;
  toolbar shortcut drags don't drop the real item. ItemEquipRules for
  multi-slot (coat) coverage via equip masks.
- Cursor phase: CursorFeedbackController (semantic priority chain:
  drag > resize > window-move > target-mode > text) + RetailCursorCatalog
  (enums 0x27/0x28/0x29, hotspot 14,14; ClientUISystem::UpdateCursorState
  0x00564630) resolved through the portal EnumIDMap chain by
  RetailCursorResolver; RetailCursorManager applies dat cursor art to the
  OS cursor. Register row AP-72 covers the OS standard-cursor fallback.
- Character window goes live: CharacterSheetProvider owns sheet assembly,
  XP-curve/raise-cost math and the raise flow — extracted out of
  GameWindow per Code Structure Rule 1 instead of committing the ~430-line
  feature body there. Optimistic XP/credit debits go through eventful
  store APIs (new ClientObjectTable.UpdateInt64Property +
  LocalPlayerState.DebitIntProperty/DebitInt64Property) instead of raw
  property-dictionary writes; register row AP-73 covers the still-missing
  raise ledger (#163).
- RetailWindowFrame: the shared nine-slice window mount recipe; the
  character window uses it, remaining windows migrate via #164.
- Status-bar buttons toggle inventory/character windows; retail row-major
  backpack ordering; WorldSession.SendUseWithTarget + raise/train sends.

GameWindow shrinks 14,214 -> 13,877 lines despite the new features; the
sheet/raise logic is unit-tested in CharacterSheetProviderTests instead
of trapped in the god object. Build green; full suite 3,286 tests pass.

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

src/AcDream.App/RuntimeOptions.cs

@@ -41,7 +41,9 @@ public sealed record RuntimeOptions(
     bool DumpLiveSpawns,
     int? LegacyStreamRadius,
     bool RetailUi,
-    string? AcDir)
+    string? AcDir,
+    bool UiProbeDump,
+    string? UiProbeScript)
 {
     /// <summary>
     /// Build options from the process environment. Used by
@@ -85,13 +87,18 @@ public sealed record RuntimeOptions(
             // top of the quality preset's radii. Null when unset or invalid.
             LegacyStreamRadius:  TryParseNonNegativeInt(env("ACDREAM_STREAM_RADIUS")),
             RetailUi:            IsExactlyOne(env("ACDREAM_RETAIL_UI")),
-            AcDir:               NullIfEmpty(env("ACDREAM_AC_DIR")));
+            AcDir:               NullIfEmpty(env("ACDREAM_AC_DIR")),
+            UiProbeDump:         IsExactlyOne(env("ACDREAM_UI_PROBE_DUMP")),
+            UiProbeScript:       NullIfEmpty(env("ACDREAM_UI_PROBE_SCRIPT")));
     }
 
     /// <summary>True iff live-mode credentials are present and valid for connecting.</summary>
     public bool HasLiveCredentials =>
         LiveMode && !string.IsNullOrEmpty(LiveUser) && !string.IsNullOrEmpty(LivePass);
 
+    /// <summary>True when the opt-in retail UI automation probe should be constructed.</summary>
+    public bool UiProbeEnabled => UiProbeDump || !string.IsNullOrEmpty(UiProbeScript);
+
     private static bool IsExactlyOne(string? s)
         => string.Equals(s, "1", StringComparison.Ordinal);