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/LiveEntityMotionRuntimeController.cs

@@ -45,8 +45,6 @@ internal sealed class LiveEntityMotionRuntimeController
             rm.Sink = new AcDream.Core.Physics.Motion.MotionTableDispatchSink(sequencer);
             rm.Motion.DefaultSink = rm.Sink;
         }
-        // #270 probe identity — strip with the probes.
-        rm.Motion.DiagnosticGuid = serverGuid;
         // #174 (2026-07-05): the RemoveLinkAnimations seam is retail
         // CPhysicsObj::RemoveLinkAnimations 0x0050fe20 — a TAILCALL to
         // CPartArray::HandleEnterWorld 0x00517d70 →