Lots more work on implementing battling

PkmnLib.Static/StatisticSet.cs

@@ -75,6 +75,7 @@ public record ImmutableStatisticSet<T>
 public record StatisticSet<T> : ImmutableStatisticSet<T>
     where T : struct
 {
+    /// <inheritdoc cref="StatisticSet{T}"/>
     public StatisticSet() : base(default, default, default, default, default, default)
     {
     }
@@ -270,6 +271,7 @@ public record StatBoostStatisticSet : ClampedStatisticSet<sbyte>
     /// <inheritdoc />
     protected override sbyte Max => 6;
 
+    /// <inheritdoc cref="StatBoostStatisticSet"/>
     public StatBoostStatisticSet() : base(0, 0, 0, 0, 0, 0)
     {
     }
@@ -292,6 +294,7 @@ public record IndividualValueStatisticSet : ClampedStatisticSet<byte>
     /// <inheritdoc />
     protected override byte Max => 31;
 
+    /// <inheritdoc cref="IndividualValueStatisticSet"/>
     public IndividualValueStatisticSet() : base(0, 0, 0, 0, 0, 0)
     {
     }
@@ -314,6 +317,7 @@ public record EffortValueStatisticSet : ClampedStatisticSet<byte>
     /// <inheritdoc />
     protected override byte Max => 252;
 
+    /// <inheritdoc cref="EffortValueStatisticSet"/>
     public EffortValueStatisticSet() : base(0, 0, 0, 0, 0, 0)
     {
     }

PkmnLib.Static/Utils/EnumerableHelpers.cs

@@ -1,7 +1,13 @@
 namespace PkmnLib.Static.Utils;
 
+/// <summary>
+/// Extension methods for <see cref="IEnumerable{T}"/>.
+/// </summary>
 public static class EnumerableHelpers
 {
+    /// <summary>
+    /// Returns all elements of the enumerable that are not null.
+    /// </summary>
     public static IEnumerable<T> WhereNotNull<T>(this IEnumerable<T?> enumerable) where T : class =>
         enumerable.Where(x => x is not null)!;
 }