Minor optimizations

Simulator/CompletionState.cs

@@ -1,6 +1,6 @@
 namespace Craftimizer.Simulator;
 
-public enum CompletionState
+public enum CompletionState : byte
 {
     Incomplete,
     ProgressComplete,

Simulator/SimulationInput.cs

@@ -1,6 +1,6 @@
 namespace Craftimizer.Simulator;
 
-public readonly record struct SimulationInput
+public record SimulationInput
 {
     public CharacterStats Stats { get; }
     public RecipeInfo Recipe { get; }