streaming: speed-aware scheduler with hysteresis (L80); arrival near-first, fast travel keeps the horizon

Policy 3 (headless + Unreal): walkable ring always first; at rest/arrival LOD0-2 before far;
walking interleaves near:far ~4:1 toward heading; fast travel admits far coarse tiles right after
the walkable ring. Hysteresis: walking 0.75/0.35 m/s, fast 12/8 m/s.
Headless, far holes while moving 30 m/s: L77 9.0% / L79 77.2% / L80 8.9%. Cold LOD0-2 ready
(one clean protocol, medians): SW 1.30, FI 3.61, TN 3.07, VS 1.43 s.
Unreal 30 m/s traces end 2,233/2,237 loaded (commandlet readiness exit 1) for all policies.
Passage zero-padding cut: ~50% fewer passage iterations on active tiles, max 6.6 cm surface
displacement, no sign flips; not adopted yet (padding sweep next). World unchanged (v213).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Source/VoxelForge/Public/VoxelWorld.h

@@ -1240,6 +1240,8 @@ public:
     bool bStartupApplyConfigTraced = false;
     uint64 LastApplyFrameCycles = 0;
     float StartupTraceSpeedCmPerSecond = 0.0f;
+    bool bSpeedAwareTravelMode = false;
+    bool bSpeedAwareFastMode = false;
     TArray<FVoxelTileKey> DesiredSorted;   // critical floor prefix, then true-pawn distance-first
     TArray<FVoxelTileKey> CriticalDesiredTiles; // occupied/support tile, then heading tile
     // Ancestor -> desired descendants, rebuilt with DesiredSorted. Reconciliation uses this
@@ -1347,6 +1349,7 @@ public:
     double HeadlessStreamingTestDistanceCm = 0.0;
     float HeadlessStreamingTestSpeedCmPerSecond = 0.0f;
     float HeadlessStreamingTestStartSeconds = 0.0f;
+    float HeadlessStreamingTestMoveDurationSeconds = 0.0f;
     float HeadlessStreamingTestExitSeconds = 0.0f;
     float HeadlessStreamingTestTeleportAtSeconds = 0.0f;
     float HeadlessStreamingTestTeleportDistanceCm = 0.0f;