feat(mosstank): add VTank-style automation PoC

src/AcDream.Core/Physics/PhysicsEngine.cs

@@ -2383,7 +2383,11 @@ public sealed class PhysicsEngine
                     body is not null ? PhysicsResolveCapture.Snapshot(body) : null);
             }
 
-            return resolveResult;
+            return resolveResult with
+            {
+                LastCollidedObjectId = ci.LastCollidedObjectGuid ?? 0u,
+                CollidedWithEnvironment = ci.CollidedWithEnvironment,
+            };
         }
         finally
         {

src/AcDream.Core/Physics/ResolveResult.cs

@@ -58,4 +58,16 @@ public readonly record struct ResolveResult(
     /// <summary>Full cell that owns <see cref="ContactPlane"/>.</summary>
     uint ContactPlaneCellId = 0,
     /// <summary>Whether the accepted contact plane is water.</summary>
-    bool ContactPlaneIsWater = false);
+    bool ContactPlaneIsWater = false)
+{
+    /// <summary>
+    /// Last live object touched by this transition, or zero for environment-
+    /// only/no collision. This is detached collision evidence, not an impact
+    /// side effect; projectile-awareness callers use it to distinguish the
+    /// designated target from an intervening creature or prop.
+    /// </summary>
+    public uint LastCollidedObjectId { get; init; }
+
+    /// <summary>Whether resident environment geometry blocked the sweep.</summary>
+    public bool CollidedWithEnvironment { get; init; }
+}