feat(runtime): define borrowed views commands and ordered events

Establish the J1 presentation-independent contract with instance-scoped clocks and generations, immutable borrowed views, typed generation-gated commands, normalized ordered diagnostics, and teardown acknowledgements. Route graphical startup plus press-time selection, movement, and combat through focused App adapters over the exact existing owners without adding a queue or mirrored world.

Validated by the Release solution build, 13 Runtime tests, 3,838 App tests with three existing skips, and the complete 8,424-test Release suite with five existing skips.

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

tests/AcDream.App.Tests/Composition/SessionStartCompositionTests.cs

@@ -1,5 +1,5 @@
 using AcDream.App.Composition;
-using AcDream.App.Net;
+using AcDream.Runtime;
 
 namespace AcDream.App.Tests.Composition;
 
@@ -11,19 +11,25 @@ public sealed class SessionStartCompositionTests
         var messages = new List<string>();
 
         SessionStartCompositionPhase.Report(
-            new LiveSessionStartResult(
-                LiveSessionStartStatus.MissingCredentials),
+            new RuntimeSessionStartResult(
+                RuntimeSessionStartStatus.MissingCredentials,
+                default),
             messages.Add);
         SessionStartCompositionPhase.Report(
-            new LiveSessionStartResult(
-                LiveSessionStartStatus.Failed,
+            new RuntimeSessionStartResult(
+                RuntimeSessionStartStatus.Failed,
+                default,
                 Error: new InvalidOperationException("boom")),
             messages.Add);
         SessionStartCompositionPhase.Report(
-            new LiveSessionStartResult(LiveSessionStartStatus.Disabled),
+            new RuntimeSessionStartResult(
+                RuntimeSessionStartStatus.Disabled,
+                default),
             messages.Add);
         SessionStartCompositionPhase.Report(
-            new LiveSessionStartResult(LiveSessionStartStatus.Connected),
+            new RuntimeSessionStartResult(
+                RuntimeSessionStartStatus.Connected,
+                default),
             messages.Add);
 
         Assert.Equal(2, messages.Count);