perf(streaming): quiesce retired generations and budget teardown

Publish the retail blocking-for-cells edge before deferred recenter work, freeze old-world presentation/simulation/audio, and advance full-window retirement from exact metered entity and owner cursors. This removes synchronous portal teardown without allowing retained owners to remain observable.

src/AcDream.App/Audio/AudioHookSink.cs

@@ -122,7 +122,14 @@ public sealed class AudioHookSink : IAnimationHookSink
         if (waveId == 0) return;
         WaveData? wave = _cache.GetWave(waveId);
         if (wave is null) return;
-        _engine.Play3DWave(waveId, wave, worldPos, volume, priority, pitch);
+        _engine.Play3DWave(
+            entityId,
+            waveId,
+            wave,
+            worldPos,
+            volume,
+            priority,
+            pitch);
     }
 }
 

src/AcDream.App/Audio/OpenAlAudioEngine.cs

@@ -54,7 +54,13 @@ namespace AcDream.App.Audio;
 /// unaffected.
 /// </para>
 /// </summary>
-public sealed unsafe class OpenAlAudioEngine : IAudioEngine
+internal interface IWorldAudioQuiescence
+{
+    void SuspendWorldAudio();
+    void ResumeWorldAudio();
+}
+
+public sealed unsafe class OpenAlAudioEngine : IAudioEngine, IWorldAudioQuiescence
 {
     // ── Backends ─────────────────────────────────────────────────────────────
     private AL? _al;
@@ -71,12 +77,14 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine
     private sealed class Slot3D
     {
         public uint SourceId;
+        public uint OwnerId;
         public float PlayingGain; // gain at play time (for eviction compare)
         public bool InUse;
         public uint PriorityBase; // raw priority from SoundEntry.Priority
     }
     private readonly Slot3D[] _pool3D = new Slot3D[PoolSize3D];
     private int _pool3DCursor; // round-robin start
+    private bool _worldAudioSuspended;
 
     private readonly uint[] _poolUi = new uint[PoolSizeUi];
 
@@ -238,6 +246,7 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine
     /// Returns true on success, false if the buffer was rejected.
     /// </summary>
     public bool Play3DWave(
+        uint ownerId,
         uint waveId,
         WaveData wave,
         Vector3 position,
@@ -245,7 +254,7 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine
         float priority,
         float pitch = 1.0f)
     {
-        if (!_available || _al is null) return false;
+        if (_worldAudioSuspended || !_available || _al is null) return false;
 
         float effectiveGain = volume * SfxVolume;
         if (effectiveGain < 0.001f) return false; // silent; skip
@@ -284,11 +293,39 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine
 
         slot.PlayingGain = effectiveGain;
         slot.InUse = true;
+        slot.OwnerId = ownerId;
         slot.PriorityBase = (uint)Math.Clamp((int)priority, 0, 7);
         _pool3DCursor = (slotIdx + 1) & (PoolSize3D - 1);
         return true;
     }
 
+    /// <summary>
+    /// Stops every world-space voice while preserving the independent UI
+    /// source pool. Retail suppresses ambient/object audio while cell loading
+    /// blocks world maintenance; stopped voices are not resumed afterward.
+    /// </summary>
+    public void SuspendWorldAudio()
+    {
+        _worldAudioSuspended = true;
+        for (int i = 0; i < _pool3D.Length; i++)
+            StopWorldSlot(_pool3D[i]);
+    }
+
+    public void ResumeWorldAudio() => _worldAudioSuspended = false;
+
+    internal void StopAllForOwner(uint ownerId)
+    {
+        if (ownerId == 0)
+            return;
+
+        for (int i = 0; i < _pool3D.Length; i++)
+        {
+            Slot3D slot = _pool3D[i];
+            if (slot.InUse && slot.OwnerId == ownerId)
+                StopWorldSlot(slot);
+        }
+    }
+
     /// <summary>
     /// Play a raw WaveData blob as a 2D UI sound (no falloff, ignores
     /// listener position).
@@ -469,4 +506,18 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine
         _al.GetSourceProperty(sourceId, GetSourceInteger.SourceState, out int state);
         return state == (int)SourceState.Playing;
     }
+
+    private void StopWorldSlot(Slot3D slot)
+    {
+        if (_available && _al is not null && slot.SourceId != 0)
+        {
+            _al.SourceStop(slot.SourceId);
+            _al.SetSourceProperty(slot.SourceId, SourceInteger.Buffer, 0);
+        }
+
+        slot.OwnerId = 0;
+        slot.PlayingGain = 0f;
+        slot.PriorityBase = 0;
+        slot.InUse = false;
+    }
 }