docs: close modern runtime slice K1

docs/architecture/acdream-architecture.md

@@ -249,8 +249,11 @@ src/
   AcDream.Headless/          Linux/Windows no-window production host
     Program.cs               -> CLI entry only
     Configuration/           -> strict versioned process/session config
+    Credentials/             -> redacted env/stdin/owner-only-file providers
+    Hosting/                 -> one GameRuntime/session/lease/policy lifetime
+    Policies/                -> typed Runtime-view/command consumers
     -> references Runtime only; no presentation/backend package
-    -> K0 complete; K1 single-session host active
+    -> K0/K1 complete; K2 scheduler and full bot-command parity active
   
   AcDream.Plugin.Abstractions/  Layer 5: plugin interfaces
     IAcDreamPlugin.cs         -> done