refactor(hosting): drop CallScript/OnStub from IHost (now trace events)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

engine/Age.Cli/Program.cs

@@ -17,7 +17,7 @@ if (args[0] == "run")
     var runHost = new CaptureHost();
     var vm = new VirtualMachine(script, table, runHost, null, provider);
     vm.Run();
-    Console.WriteLine($"{Path.GetFileName(args[1])}: {vm.Steps} steps, {vm.Emitted.Count} show-text, {runHost.CallScriptCount} call-scripts (halt: {vm.HaltReason})");
+    Console.WriteLine($"{Path.GetFileName(args[1])}: {vm.Steps} steps, {vm.Emitted.Count} show-text, {vm.CallScriptDispatches} call-scripts (halt: {vm.HaltReason})");
     foreach (var (off, text, scr) in vm.Emitted.Take(30)) Console.WriteLine($"  [{scr} 0x{off:x}] {text}");
     var sources = vm.Emitted.Select(e => e.Script).Distinct().ToList();
     Console.WriteLine($"source scripts ({sources.Count}): {string.Join(", ", sources)}");
@@ -213,8 +213,6 @@ sealed class AudioTraceHost : IHost
             : $"{e.Archive} {e.Name}" + (ResourceMap.AudioPath(e) == null ? " [NO FILE]" : "")));
     }
     public void ShowText(int offset, string text) { }
-    public void CallScript(long id) { }
-    public void OnStub(int opcode) { }
     public void WaitForInput() { }
     public void CreateTexture(int slot, int width, int height) { }
     public void SetTexture(long resourceId, int slot) { }
@@ -263,8 +261,6 @@ sealed class GfxTraceHost : IHost
         Events.Add($"create-texture slot={slot} {width}x{height}");
     }
     public void ShowText(int offset, string text) { }
-    public void CallScript(long id) { }
-    public void OnStub(int opcode) { }
     public void WaitForInput() { }
     public void PlayBgm(long id) { }
     public void PlayVoice(long id) { }

engine/Age.Engine.Tests/CallScriptIntegrationTests.cs

@@ -7,10 +7,7 @@ public class CallScriptIntegrationTests
 {
     private sealed class NullHost : IHost
     {
-        public int CallScripts;
         public void ShowText(int o, string t) { }
-        public void CallScript(long id) => CallScripts++;
-        public void OnStub(int op) { }
         public void WaitForInput() { }
         public void CreateTexture(int s, int w, int h) { }
         public void SetTexture(long r, int s) { }

engine/Age.Engine.Tests/CallScriptTests.cs

@@ -13,10 +13,7 @@ public class CallScriptTests
 
     private sealed class NullHost : IHost
     {
-        public List<long> Calls = new();
         public void ShowText(int o, string t) { }
-        public void CallScript(long id) => Calls.Add(id);
-        public void OnStub(int op) { }
         public void WaitForInput() { }
         public void CreateTexture(int s, int w, int h) { }
         public void SetTexture(long r, int s) { }

engine/Age.Engine.Tests/GameSessionTests.cs

@@ -28,8 +28,6 @@ public class GameSessionTests
         public int Voices;
         public List<int> Emitted = new();
         public void ShowText(int o, string t) => Emitted.Add(o);
-        public void CallScript(long id) { }
-        public void OnStub(int op) { }
         public void WaitForInput() { }
         public void CreateTexture(int s, int w, int h) { }
         public void SetTexture(long r, int s) { }

engine/Age.Engine.Tests/TestSupport.cs

@@ -8,11 +8,9 @@ using Age.Engine.Model;
 /// provider for synthetic call-script targets.</summary>
 internal sealed class RecordingHost : IHost
 {
-    public int Waits, CallScripts;
+    public int Waits;
     public readonly List<(int Offset, string Text)> Lines = new();
     public void ShowText(int offset, string text) => Lines.Add((offset, text));
-    public void CallScript(long id) => CallScripts++;
-    public void OnStub(int opcode) { }
     public void WaitForInput() => Waits++;
     public void CreateTexture(int slot, int w, int h) { }
     public void SetTexture(long resId, int slot) { }

engine/Age.Engine.Tests/TextureGeometryTests.cs

@@ -10,8 +10,6 @@ public class TextureGeometryTests
     private sealed class FakeSizeHost : IHost
     {
         public void ShowText(int o, string t) { }
-        public void CallScript(long id) { }
-        public void OnStub(int op) { }
         public void WaitForInput() { }
         public void CreateTexture(int slot, int w, int h) { }
         public void SetTexture(long resId, int slot) { }

engine/Age.Engine.Tests/TextureOpsTests.cs

@@ -12,8 +12,6 @@ public class TextureOpsTests
         public List<(int slot, int w, int h)> Draws = new();
         public int Creates;
         public void ShowText(int o, string t) { }
-        public void CallScript(long id) { }
-        public void OnStub(int op) { }
         public void WaitForInput() { }
         public void CreateTexture(int slot, int w, int h) => Creates++;
         public void SetTexture(long resId, int slot) => Sets.Add((resId, slot));

engine/Age.Engine/Hosting/CaptureHost.cs

@@ -2,11 +2,7 @@ namespace Age.Engine.Hosting;
 public sealed class CaptureHost : IHost
 {
     public List<(int Offset, string Text)> Emitted { get; } = new();
-    public int CallScriptCount { get; private set; }
-    public Dictionary<int, int> Stubs { get; } = new();
     public void ShowText(int offset, string text) => Emitted.Add((offset, text));
-    public void CallScript(long id) => CallScriptCount++;
-    public void OnStub(int opcode) { Stubs.TryGetValue(opcode, out var c); Stubs[opcode] = c + 1; }
     public void WaitForInput() { }
     public void CreateTexture(int slot, int width, int height) { }
     public void SetTexture(long resourceId, int slot) { }

engine/Age.Engine/Hosting/IHost.cs

@@ -2,8 +2,6 @@ namespace Age.Engine.Hosting;
 public interface IHost
 {
     void ShowText(int offset, string text);
-    void CallScript(long id);
-    void OnStub(int opcode);
     void WaitForInput();
     void CreateTexture(int slot, int width, int height);
     void SetTexture(long resourceId, int slot);