Initial commit: Theriapolis baseline at port/godot branch point

Captures the pre-Godot-port state of the codebase. This is the rollback
anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md).
All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Theriapolis.Core/Rules/Combat/AttackResult.cs

@@ -0,0 +1,30 @@
+namespace Theriapolis.Core.Rules.Combat;
+
+/// <summary>
+/// Outcome of a single <see cref="Resolver.AttemptAttack"/> call. Captures
+/// every dice value for log reconstruction and test assertions.
+/// </summary>
+public sealed record AttackResult
+{
+    public required int  AttackerId      { get; init; }
+    public required int  TargetId        { get; init; }
+    public required string AttackName    { get; init; }
+    public required int  D20Roll         { get; init; }   // the kept d20 (post advantage/disadvantage)
+    public          int? D20Other        { get; init; }   // the other d20 when adv/disadv was rolled
+    public required int  ToHitBonus      { get; init; }
+    public required int  AttackTotal     { get; init; }   // D20Roll + ToHitBonus
+    public required int  TargetAc        { get; init; }   // includes cover
+    public required bool Hit             { get; init; }
+    public required bool Crit            { get; init; }
+    public required int  DamageRolled    { get; init; }   // 0 if missed
+    public required int  TargetHpAfter   { get; init; }
+    public required SituationFlags Situation { get; init; }
+
+    public string FormatLog(string attackerName, string targetName)
+    {
+        if (!Hit)
+            return $"{attackerName} → {targetName}: miss ({AttackName} {AttackTotal} vs AC {TargetAc})";
+        string critTag = Crit ? " [CRIT]" : "";
+        return $"{attackerName} → {targetName}: {DamageRolled} dmg ({AttackName} {AttackTotal} vs AC {TargetAc}){critTag} → HP {TargetHpAfter}";
+    }
+}