feat(rank-progress): RankProgressResult carries TierAdvanced signal

RankProgressResult gains a TierAdvanced bool (defaulted false so the 7-arg
positional-constructor sites don't break). Set true iff the grant is a win
AND RankTier.Name resolves both pre-grant and post-grant to distinct strings —
i.e. a promotion crossed a tier boundary.

Explicitly guards on isWin so a demotion (in principle possible after a loss
below a tier floor, though the current floor rules prevent it) never fires
the achievement backward.

Three new tests: no-cross win, beginner→d cross, loss stays false.

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

SVSim.UnitTests/Services/RankProgressServiceTests.cs

@@ -242,4 +242,45 @@ public class RankProgressServiceTests
         Assert.That(r.AfterMasterPoint, Is.EqualTo(0));
         Assert.That(v.RankProgress, Is.Empty);
     }
+
+    // ---- TierAdvanced ----
+
+    [Test]
+    public async Task TierAdvanced_is_false_when_win_stays_within_same_tier()
+    {
+        // Point 100 (Beginner 1, rank 2) + 100 win = 200 (Beginner 3, rank 4). Still beginner.
+        var svc = NewService();
+        var v = NewViewer(Format.Rotation, point: 100, masterPoint: 0);
+
+        var r = await svc.GrantAsync(v, Format.Rotation, isWin: true);
+
+        Assert.That(RankTier.Name(r.Rank), Is.EqualTo("beginner"));
+        Assert.That(r.TierAdvanced, Is.False);
+    }
+
+    [Test]
+    public async Task TierAdvanced_is_true_when_win_crosses_beginner_to_d()
+    {
+        // Point 1150 (Beginner 3, rank 4 — needs 1200 to leave beginner) + 100 = 1250 = D0 (rank 5).
+        var svc = NewService();
+        var v = NewViewer(Format.Rotation, point: 1150, masterPoint: 0);
+
+        var r = await svc.GrantAsync(v, Format.Rotation, isWin: true);
+
+        Assert.That(r.Rank, Is.EqualTo(5), "Expected promotion to rank 5 (D0)");
+        Assert.That(r.TierAdvanced, Is.True);
+    }
+
+    [Test]
+    public async Task TierAdvanced_is_false_on_loss_even_if_tier_string_changes()
+    {
+        // Loss can't advance a tier — even if it demoted, the achievement doesn't fire backward.
+        // Point 1200 (D0, rank 5) - 50 loss = 1200 (floored). Still D0. Prove flag stays false.
+        var svc = NewService();
+        var v = NewViewer(Format.Rotation, point: 1200, masterPoint: 0);
+
+        var r = await svc.GrantAsync(v, Format.Rotation, isWin: false);
+
+        Assert.That(r.TierAdvanced, Is.False);
+    }
 }