Move input contracts to model

engine/Age.Engine/Model/InputContracts.cs

@@ -0,0 +1,8 @@
+namespace Age.Engine.Model;
+
+public readonly record struct AdvAutoWaitState(
+    bool Enabled, bool VoicePending, long PostVoiceDelayMs, long UnvoicedDelayMs);
+
+/// <summary>AGERc command 10's synchronous full-width text edit request and result.</summary>
+public readonly record struct FullwidthTextEditRequest(string CurrentText, string InitialText);
+public readonly record struct FullwidthTextEditResult(bool Accepted, string Text);