Merge feature/animation-system-complete — Phase L.1c animation MVP

21 commits porting retail's MoveToManager-equivalent client-side
behavior for server-controlled creature locomotion and combat
engagement. Shipped as MVP after live visual verification across
multiple iteration rounds with the user.

Highlights:
- 186a584 — initial Phase L.1c port: extracts Origin / target guid /
  MovementParameters block from MoveTo packets (movementType 6/7),
  adds RemoteMoveToDriver per-tick body-orientation steering with
  ±20° aux-turn-equivalent snap tolerance.
- d247aef — corrected arrival predicate semantics + 1.5 s
  stale-destination timeout for entities leaving the streaming view.
- f794832 — root-caused "creature won't stop to attack" via two
  research subagents converging on retail
  CMotionInterp::move_to_interpreted_state's unconditional
  forward_command bulk-copy. Lifted ServerMoveToActive flag clearing
  + InterpretedState bulk-copy out of substate-only branch so
  Action-class swing UMs (mt=0 ForwardCommand=AttackHigh1) clear
  stale MoveTo state and zero forward velocity.
- ff6d3d0 — RemoteMoveToDriver.ClampApproachVelocity caps horizontal
  velocity at the final-approach tick so body lands EXACTLY at
  DistanceToObject instead of overshooting through the player.
- 37de771 — bulk-copy ForwardCommand for MoveTo packets too (closed
  the regression where MoveTo creatures stayed at default
  ForwardCommand=Ready in InterpretedState and only translated via
  UpdatePosition snaps).
- 34d7f4d + e71ed73 — AnimationSequencer.HasCycle query +
  fallback chain (requested → WalkForward → Ready → no-op) at BOTH
  the OnLiveMotionUpdated path AND the spawn handler. Prevents
  ClearCyclicTail from wiping the body's cyclic tail when ACE
  CreateObject carries CurrentMotionState.ForwardCommand pointing
  to an Action-class motion (e.g. AttackHigh1 from a mid-swing
  creature) which has no cyclic-table entry — was the "torso on
  the ground" symptom for monsters seen in combat by a fresh
  observer.

Cross-references: docs/research/named-retail/acclient_2013_pseudo_c.txt
(MoveToManager 0x00529680 + 0x0052a240 + 0x00529d80,
CMotionInterp::move_to_interpreted_state 0x00528xxx,
MovementParameters::UnPackNet 0x0052ac50), references/ACE/Source/
ACE.Server/Physics/Animation/MoveToManager.cs (port aid),
references/holtburger/ (cross-check on snapshot-only client
behavior), docs/research/2026-04-28-remote-moveto-pseudocode.md
(the Phase L.1c pseudocode doc).

Tests: 1404 → 1422 (parser type-7 path retention, type-6 target
guid retention, driver arrival semantics, retail-faithful
chase/flee branches, approach-velocity clamp scenarios,
HasCycle present/missing, AttackHigh1 wire layout).

Pending follow-ups (filed for future): target-guid live resolution
for type 6 packets (residual chase lag), StickToObject sticky-target
guid trailing field, full MoveToManager state machine port
(CheckProgressMade stall detector, Sticky/StickTo, use_final_heading,
pending_actions queue).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/AcDream.Core.Tests/World/WorldTimeDebugTests.cs

@@ -4,6 +4,7 @@ using Xunit;
 
 namespace AcDream.Core.Tests.World;
 
+[Collection(DerethDateTimeCollection.Name)]
 public sealed class WorldTimeDebugTests
 {
     [Fact]