refactor(app): compose session and player startup

Move streaming, live-session, hydration, local-player, combat, and teleport construction behind the typed Phase-7 boundary. Add exact-owner runtime bindings and focused spawn-claim classification so partial startup rolls back without retaining old session targets while preserving the accepted construction and frame dependencies.

Co-authored-by: Codex <codex@openai.com>

tests/AcDream.App.Tests/Rendering/DevToolsFramePresenterTests.cs

@@ -1,6 +1,7 @@
 using System.Numerics;
 using System.Reflection;
 using AcDream.App.Diagnostics;
+using AcDream.App.Net;
 using AcDream.App.Rendering;
 using AcDream.UI.Abstractions;
 
@@ -8,6 +9,24 @@ namespace AcDream.App.Tests.Rendering;
 
 public sealed class DevToolsFramePresenterTests
 {
+    [Fact]
+    public void CommandBusOwnedBindingReleasesExactlyAndAllowsRebind()
+    {
+        var source = new DevToolsCommandBusSource();
+        using var first = new LiveSessionController();
+        using var second = new LiveSessionController();
+
+        IDisposable firstBinding = source.BindOwned(first);
+        Assert.Same(first.Commands, source.Current);
+        Assert.Throws<InvalidOperationException>(() => source.BindOwned(second));
+
+        firstBinding.Dispose();
+        using IDisposable secondBinding = source.BindOwned(second);
+        firstBinding.Dispose();
+
+        Assert.Same(second.Commands, source.Current);
+    }
+
     [Fact]
     public void Frame_PreservesBeginThenMenuPanelsAndDrawDataOrder()
     {

tests/AcDream.App.Tests/Rendering/DevToolsRuntimeSourcesTests.cs

@@ -61,6 +61,25 @@ public sealed class DevToolsRuntimeSourcesTests
         Assert.Throws<ObjectDisposedException>(() => source.Bind(first));
     }
 
+    [Fact]
+    public void PlayerModeOwnedBindingReleasesExactlyAndAllowsRebind()
+    {
+        var source = new DeferredDevToolsPlayerModeCommands();
+        var first = new PlayerModeTarget();
+        var second = new PlayerModeTarget();
+
+        IDisposable firstBinding = source.BindOwned(first);
+        Assert.Throws<InvalidOperationException>(() => source.BindOwned(second));
+
+        firstBinding.Dispose();
+        using IDisposable secondBinding = source.BindOwned(second);
+        firstBinding.Dispose();
+        source.ToggleFlyOrChase();
+
+        Assert.Equal(0, first.ToggleCalls);
+        Assert.Equal(1, second.ToggleCalls);
+    }
+
     [Fact]
     public void WorldCountSlotCannotFreezeOrReleaseTheWrongWorld()
     {

tests/AcDream.App.Tests/Rendering/GameWindowRenderLeafCompositionTests.cs

@@ -39,14 +39,24 @@ public sealed class GameWindowRenderLeafCompositionTests
     [Fact]
     public void Composition_transfers_portal_tunnel_before_constructing_frame_borrowers()
     {
+        string phase = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src",
+            "AcDream.App",
+            "Composition",
+            "SessionPlayerComposition.cs"));
         string source = GameWindowSource();
 
+        AssertAppearsInOrder(
+            phase,
+            "d.PortalTunnelFallback.Transfer(",
+            "new LocalPlayerTeleportController(",
+            "new LocalPlayerTeleportPresentation(portalTunnel)",
+            "d.TeleportSink.BindOwned(localTeleport)",
+            "_publication.PublishSessionPlayer(result);");
         AssertAppearsInOrder(
             source,
-            "_portalTunnelFallback.Transfer(",
-            "new AcDream.App.Streaming.LocalPlayerTeleportController(",
-            "new AcDream.App.Streaming.LocalPlayerTeleportPresentation(",
-            "_localPlayerTeleportSink.Bind(_localPlayerTeleport);",
+            "new SessionPlayerCompositionPhase(",
             "new AcDream.App.Rendering.LocalPlayerTeleportRenderStateSource(",
             "new AcDream.App.Rendering.RenderFrameResourceController(",
             "new AcDream.App.Rendering.PrivatePresentationRenderer(",

tests/AcDream.App.Tests/Rendering/GameWindowSlice8BoundaryTests.cs

@@ -217,7 +217,7 @@ public sealed class GameWindowSlice8BoundaryTests
             "private AcDream.App.Net.LiveSessionHost");
         string body = MethodBody(
             "private void OnFramebufferResize(",
-            "private (uint Claim, bool Unhydratable)? _spawnClaimRangeMemo;");
+            "private void OnClosing()");
 
         Assert.Contains("=> _framebufferResize.Resize(newSize);", body, StringComparison.Ordinal);
         Assert.DoesNotContain("Viewport(", body, StringComparison.Ordinal);
@@ -294,8 +294,18 @@ public sealed class GameWindowSlice8BoundaryTests
             "new SettingsDevToolsCompositionPhase(",
             "this).Compose(platform, hostInputCamera, contentEffectsAudio);",
             "new WorldRenderCompositionPhase(",
-            "_runtimeSettings.BindRuntimeTargets(",
+            "new SessionPlayerCompositionPhase(",
             "_liveSessionHost.Start(_options)");
+        string sessionPhase = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src",
+            "AcDream.App",
+            "Composition",
+            "SessionPlayerComposition.cs"));
+        Assert.Contains(
+            "d.Settings.BindRuntimeTargetsOwned(settingsTargets)",
+            sessionPhase,
+            StringComparison.Ordinal);
         string settingsPhase = File.ReadAllText(Path.Combine(
             FindRepoRoot(),
             "src",
@@ -320,7 +330,8 @@ public sealed class GameWindowSlice8BoundaryTests
         AssertAppearsInOrder(
             shutdown,
             "_runtimeSettings.UnbindViewModel()",
-            "_runtimeSettings.UnbindRuntimeTargets",
+            "new ResourceShutdownStage(\"frame borrowers\"",
+            "bindings.Dispose();",
             "_retailUiLease.Dispose()",
             "_streamer?.Dispose()",
             "_wbDrawDispatcher?.Dispose()",
@@ -425,7 +436,6 @@ public sealed class GameWindowSlice8BoundaryTests
             "pointer.Dispose();",
             "new ResourceShutdownStage(\"session dependents\"",
             "pointer.ReleaseMouseLookAfterSessionRetirement();",
-            "pointer.UnbindGameplayFrame(gameplayFrame);",
             "_cameraPointerInput = null;");
         AssertAppearsInOrder(
             dispose,
@@ -472,6 +482,12 @@ public sealed class GameWindowSlice8BoundaryTests
             "Composition",
             "WorldRenderComposition.cs"));
         string livePhase = LivePresentationSource();
+        string sessionPhase = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src",
+            "AcDream.App",
+            "Composition",
+            "SessionPlayerComposition.cs"));
 
         AssertAppearsInOrder(
             livePhase,
@@ -483,8 +499,13 @@ public sealed class GameWindowSlice8BoundaryTests
             load,
             "new WorldRenderCompositionPhase(",
             "new LivePresentationCompositionPhase(",
-            "_portalTunnelFallback.Transfer(",
+            "new SessionPlayerCompositionPhase(",
             "_frameGraphs.Publish(updateFrameOrchestrator, renderFrameOrchestrator);");
+        AssertAppearsInOrder(
+            sessionPhase,
+            "d.PortalTunnelFallback.Transfer(",
+            "new LocalPlayerTeleportController(",
+            "_publication.PublishSessionPlayer(result);");
         AssertAppearsInOrder(
             worldPhase,
             "lifetime.AcquireTerrainAtlas(",