fix #270 closeout: strip investigation probes; close the issue

User-verified: casting fixed (exhaustion-edge gate) and monster attack
animations restored (spawn settle placement + lost-cell retry). Final
session evidence: 14/15 spawn settles grounded; Falling-refusal spam
collapsed 2,954 -> 15 transient pre-settle lines.

Strips the [UM-ACT]/[MT-FAIL]/[SPAWN-PLACE]/[remote-edge] probes, the
MotionInterpreter.DiagnosticGuid plumbing, and the two throwaway probe
tests (motion-table attack sweep, vitae color dump - both findings are
recorded in ISSUES/research). Complete Release suite: 10,030 passed /
5 skips / 0 failures.

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

src/AcDream.App/Physics/LiveEntityNetworkUpdateController.cs

@@ -205,13 +205,6 @@ internal sealed class LiveEntityNetworkUpdateController
             body: remote.Body,
             moverFlags: moverFlags,
             movingEntityId: entity.Id);
-        if (AcDream.Core.Physics.PhysicsDiagnostics.DumpMotionEnabled)
-        {
-            Console.WriteLine(
-                $"[SPAWN-PLACE] guid={serverGuid:X8} cell=0x{cellId:X8} ok={settle.Ok} "
-                + $"contact={settle.InContact} walkable={settle.OnWalkable} "
-                + $"z={worldPos.Z:F3}->{settle.Position.Z:F3}");
-        }
         if (!settle.Ok || !settle.InContact)
             return; // no floor within reach — stays airborne like retail's fall