feat(hs): sequential statue spawn + guard mobs + win detection

Adds HeykelSavasiContext runtime logic for Task 4.2: per-team statue
break progress/winner tracking (extracted into a pure, testable
StatueProgressState), OnDestructibleDied wiring against the base
MiniGameContext's existing Destructible->Died auto-subscription, and
SpawnStatueAsync which spawns the next statue (561) + 4 guards (580)
via the map initializer using placeholder line-of-statues coordinates.
OnGameStartAsync now spawns each team's first statue after the warp.

tests/MUnique.OpenMU.Tests/HeykelSavasi/HeykelSavasiContextTests.cs

@@ -34,4 +34,51 @@ public class HeykelSavasiContextTests
     {
         Assert.That(HeykelSavasiContext.IsJoinAllowed(0, 0, HeykelSavasiTeam.None), Is.False);
     }
+
+    /// <summary>
+    /// Exercises the statue-break progress/win-detection transition used by
+    /// <c>HeykelSavasiContext.HandleStatueDestroyed</c> (runtime) and
+    /// <c>HeykelSavasiContext.RegisterStatueDestroyedForTest</c> (test-only wrapper around it).
+    /// </summary>
+    /// <remarks>
+    /// Like <see cref="HeykelSavasiContext.IsJoinAllowed"/> above, the progress/winner transition is
+    /// extracted into a small dependency-free type, <see cref="HeykelSavasiContext.StatueProgressState"/>,
+    /// so it can be driven directly here instead of through a fully constructed
+    /// <see cref="HeykelSavasiContext"/> (which needs a live game context/map initializer and starts a
+    /// background game loop).
+    /// </remarks>
+    [Test]
+    public void StatueProgress_IncrementsAndDetectsWin()
+    {
+        var state = new HeykelSavasiContext.StatueProgressState();
+
+        // Red breaks Blue's 7 statues, one by one; the winner must not be set before the 7th.
+        for (var i = 0; i < 7; i++)
+        {
+            Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.None));
+            state.RegisterDestroyed(i, HeykelSavasiTeam.Red);
+        }
+
+        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Red));
+        Assert.That(state.GetProgress(HeykelSavasiTeam.Red), Is.EqualTo(7));
+    }
+
+    [Test]
+    public void StatueProgress_IgnoresFurtherRegistrationsAfterWinnerIsSet()
+    {
+        var state = new HeykelSavasiContext.StatueProgressState();
+
+        for (var i = 0; i < 7; i++)
+        {
+            state.RegisterDestroyed(i, HeykelSavasiTeam.Blue);
+        }
+
+        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Blue));
+
+        // A further "destruction" for the other team must not overwrite the already-decided winner.
+        state.RegisterDestroyed(0, HeykelSavasiTeam.Red);
+
+        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Blue));
+        Assert.That(state.GetProgress(HeykelSavasiTeam.Red), Is.EqualTo(0));
+    }
 }