docs(linux): close Slice L0

docs/architecture/acdream-architecture.md

@@ -241,6 +241,9 @@ src/
     World/
       RuntimeWorldEnvironmentState.cs -> canonical calendar/time/weather owner
       RuntimeWorldTransitState.cs -> canonical reveal generation/readiness owner
+    Platform/
+      ApplicationPathSet.cs -> shared BCL-only XDG/Windows config, data,
+                               cache, plugin, screenshot, and diagnostic paths
     RuntimeGenerationReset.cs -> one retryable canonical-generation reset
     -> Slice J complete; graphical and no-window hosts share one GameRuntime
     -> may reference Core, Core.Net, Content, and Plugin.Abstractions only
@@ -266,6 +269,11 @@ src/
     ISelectionService.cs      -> done
   
   AcDream.App/               Layer 1 + Layer 4 wiring
+    Platform/
+      GraphicalHostPlatformServices.cs -> one startup OS/architecture/RID,
+                                          native-manifest, path, pacing owner
+      GraphicalLegacyConfigurationMigrator.cs -> no-overwrite Windows
+                                                  LocalAppData migration
     Physics/
       ProjectileController.cs -> live-record projectile orchestration/corrections
       RemotePhysicsUpdater.cs -> ordinary/Hidden remote narrow-tick integration
@@ -283,6 +291,8 @@ src/
       RetailLiveFrameCoordinator.cs -> object/physics-before-network frame barrier
     Rendering/
       GameWindow.cs           -> native composition/callback shell
+      FramePacingWaiterFactory.cs -> startup-selected Windows/Linux waiter
+      LinuxMonotonicFramePacingWaiter.cs -> absolute CLOCK_MONOTONIC sleep
       LiveEntityAnimationScheduler.cs -> canonical ordinary live-object workset
       RetailStaticAnimatingObjectScheduler.cs -> retail static-animation workset
       StaticLiveRootCommitter.cs -> static root pose/collision commit boundary