docs(headless): close modern runtime slice K

docs/architecture/acdream-architecture.md

@@ -253,7 +253,10 @@ src/
     Hosting/                 -> one GameRuntime/session/lease/policy lifetime
     Policies/                -> typed Runtime-view/command consumers
     -> references Runtime only; no presentation/backend package
-    -> K0-K2 complete; shared process-content ownership (K3) active
+    -> Slice K complete: portable single/multi-session production host,
+       deterministic scheduler/bot API, shared immutable process content,
+       1/5/10/30-root isolation/endurance, numeric resource envelope, and
+       exact connected/terminal convergence
   
   AcDream.Plugin.Abstractions/  Layer 5: plugin interfaces
     IAcDreamPlugin.cs         -> done