fix(world): restore portal and distant use lifecycles

docs/research/2026-07-15-retail-portal-space-pseudocode.md

@@ -446,6 +446,57 @@ state through `CPhysicsObj::set_state` `0x00514DD0`. Separately,
 `CPhysicsObj::UpdatePositionInternal` `0x00512C30` skips `CPartArray::Update`
 while Hidden, so ordinary animation never advances behind the portal viewport.
 
+### Destination simulation resumes before the portal viewport exits
+
+The retail destination has two different release edges. They must not share
+one acdream gate:
+
+```text
+SmartBox::DoSetState(player, visible):
+    set_state(...)
+    waiting_for_teleport = false
+
+SmartBox::UseTime(next frame):
+    if not cell_manager.blocking_for_cells:
+        position_update_complete = true
+        CObjectMaint::UseTime()
+        CPhysics::UseTime()
+
+gmSmartBoxUI::UseTime:
+    if SmartBox::teleport_in_progress() changed from true to false:
+        EndTeleportAnimation()
+
+gmSmartBoxUI::EndTeleportAnimation @ 0x004D65A0:
+    teleportAnimState = TAS_TUNNEL_CONTINUE
+    teleportTransitionStartTime = Timer::cur_time
+    clear temporary FOV override
+
+gmSmartBoxUI::UseTime, at least two seconds later:
+    TAS_TUNNEL_CONTINUE -> TAS_TUNNEL_FADE_OUT
+    ...
+    TAS_TUNNEL_FADE_OUT -> TAS_WORLD_FADE_IN
+    hide portal viewport
+    show SmartBox world viewport
+```
+
+Therefore `TAS_TUNNEL_CONTINUE` is not a continued cell-loading freeze. The
+destination world is already ticking behind the private portal viewport for at
+least two seconds. That hidden interval is when the player pose, queued
+Hidden/UnHide PhysicsScripts, attached emitters, and destination presentation
+settle. Only the later `TUNNEL_FADE_OUT -> WORLD_FADE_IN` edge changes which
+viewport is drawn.
+
+Holding acdream's world-generation quiescence until the viewport swap is a
+behavioral error: the first destination physics/effect tick occurs on the
+first visible world frame, producing a character pop plus leftover recall or
+purple materialization effects. The faithful split is:
+
+- end world simulation/audio quiescence when the accepted destination is
+  materialized and `TunnelContinue` begins;
+- retain the destination streaming/resource reservation and keep drawing only
+  the portal viewport until the later viewport-swap edge;
+- keep LoginComplete on the final one-second `WorldFadeIn -> Off` edge.
+
 ACE schedules lifestone recall teleport after the MotionTable-reported action
 length. With the installed human DATs, the boundary is about 15.06024 seconds;
 floating-point conversion can leave acdream at frame 149.999998 of the