feat(net+app): Phase 6.3 — extract server MotionTableId and use as resolver override

The Foundry's drudge statue Setup (0x020007DD) has DefaultMotionTable=0,
so MotionResolver returned null and the renderer fell back to
PlacementFrames[Default] — an upright pose, which is wrong. The retail
crouched/aggressive pose comes from a per-instance motion table the
server attaches via PhysicsDescriptionFlag.MTable (confirmed live as
0x090000DA for the statue).

CreateObject.TryParse was already walking the MTable field but
discarding the value. Now it captures it as Parsed.MotionTableId and
WorldSession.EntitySpawn forwards it. GameWindow passes it as the
motionTableIdOverride to MotionResolver.GetIdleFrame, so the cycle
lookup uses the server-supplied table when the dat-side default is
empty. With this in place the drudge resolves a real cycle and
renders in the correct crouched pose.

Trimmed the heavy STATUE motion-table dump diagnostics now that the
mechanism is verified; left a one-line summary so future regressions
remain debuggable. 160 tests green.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -542,6 +542,7 @@ public sealed class GameWindow : IDisposable
         if (isStatue)
         {
             Console.WriteLine($"live:   [STATUE] objScale={spawn.ObjScale?.ToString("F3") ?? "null"}");
+            Console.WriteLine($"live:   [STATUE] mtable=0x{(spawn.MotionTableId ?? 0):X8} stance=0x{(spawn.MotionState?.Stance ?? 0):X4} cmd=0x{(spawn.MotionState?.ForwardCommand ?? 0):X4}");
             if (spawn.TextureChanges is { } tcs)
             {
                 foreach (var tc in tcs)
@@ -577,7 +578,6 @@ public sealed class GameWindow : IDisposable
                         int subCount = pgfx?.Surfaces.Count ?? -1;
                         Console.WriteLine($"live:   [STATUE]   part[{pi}] gfxObj=0x{partGfxId:X8} surfaces={subCount}");
                     }
-                    // The placement frame the existing flatten logic uses.
                     Console.WriteLine($"live:   [STATUE]   placementFrames count={baseSetup.PlacementFrames.Count}");
                 }
             }
@@ -633,8 +633,14 @@ public sealed class GameWindow : IDisposable
         // resolving the cycle key from those gives the aggressive crouch.
         ushort? stanceOverride = spawn.MotionState?.Stance;
         ushort? commandOverride = spawn.MotionState?.ForwardCommand;
+        // Critical for entities like the Foundry's drudge statue: their
+        // base Setup has DefaultMotionTable=0, but the server tells us
+        // which motion table to use via PhysicsDescriptionFlag.MTable.
+        // Without this override the resolver returns null and we fall
+        // back to PlacementFrames[Default] which renders the wrong pose.
         var idleFrame = AcDream.Core.Meshing.MotionResolver.GetIdleFrame(
-            setup, _dats, motionTableIdOverride: null,
+            setup, _dats,
+            motionTableIdOverride: spawn.MotionTableId,
             stanceOverride: stanceOverride,
             commandOverride: commandOverride);
         var flat = AcDream.Core.Meshing.SetupMesh.Flatten(setup, idleFrame);

src/AcDream.Core.Net/Messages/CreateObject.cs

@@ -91,7 +91,8 @@ public static class CreateObject
         uint? BasePaletteId,
         float? ObjScale,
         string? Name,
-        ServerMotionState? MotionState);
+        ServerMotionState? MotionState,
+        uint? MotionTableId);
 
     /// <summary>
     /// The relevant subset of the server-sent <c>MovementData</c> /
@@ -156,6 +157,7 @@ public static class CreateObject
         uint? setupTableId = null;
         float? objScale = null;
         ServerMotionState? motionState = null;
+        uint? motionTableId = null;
 
         try
         {
@@ -274,6 +276,7 @@ public static class CreateObject
             if ((physicsFlags & PhysicsDescriptionFlag.MTable) != 0)
             {
                 if (body.Length - pos < 4) return null;
+                motionTableId = BinaryPrimitives.ReadUInt32LittleEndian(body.Slice(pos));
                 pos += 4;
             }
 
@@ -346,13 +349,13 @@ public static class CreateObject
             }
 
             return new Parsed(guid, position, setupTableId, animParts,
-                textureChanges, subPalettes, basePaletteId, objScale, name, motionState);
+                textureChanges, subPalettes, basePaletteId, objScale, name, motionState, motionTableId);
 
             // Local helper: if we ran out of fields past PhysicsData, still
             // return the useful prefix (guid/position/setup/animParts/textures/palettes/scale/motion).
             Parsed PartialResult() => new(
                 guid, position, setupTableId, animParts,
-                textureChanges, subPalettes, basePaletteId, objScale, null, motionState);
+                textureChanges, subPalettes, basePaletteId, objScale, null, motionState, motionTableId);
         }
         catch
         {

src/AcDream.Core.Net/WorldSession.cs

@@ -52,7 +52,8 @@ public sealed class WorldSession : IDisposable
         uint? BasePaletteId,
         float? ObjScale,
         string? Name,
-        CreateObject.ServerMotionState? MotionState);
+        CreateObject.ServerMotionState? MotionState,
+        uint? MotionTableId);
 
     /// <summary>Fires when the session finishes parsing a CreateObject.</summary>
     public event Action<EntitySpawn>? EntitySpawned;
@@ -238,7 +239,8 @@ public sealed class WorldSession : IDisposable
                         parsed.Value.BasePaletteId,
                         parsed.Value.ObjScale,
                         parsed.Value.Name,
-                        parsed.Value.MotionState));
+                        parsed.Value.MotionState,
+                        parsed.Value.MotionTableId));
                 }
             }
         }