Review slice 9 C-D: persist clash opinions and the bully's victim.

FinishConflict never set RosterTalkDirty, so people.json skipped quarrel shifts until some other save — the same seam as the A-B talk-circle fix. First BullyVictimId write stayed in RAM only.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.Simulation.Tests/QuarrelFightTests.cs

@@ -50,6 +50,51 @@ public class QuarrelFightTests
         }
     }
 
+    [Fact]
+    public void QuarrelFinish_MarksTickPeopleChangedSoSaveWritesOpinions()
+    {
+        var (school, first, second) = TwoPupilsOnBreak();
+        using (school)
+        {
+            const int baseline = -55;
+            OpinionStore.Set(first, second.Id, baseline);
+            OpinionStore.Set(second, first.Id, baseline);
+            PlaceAt(school, first.Id, "yard");
+            PlaceAt(school, second.Id, "yard");
+            Assert.True(school.TryStartAction(first.Id, TalkActions.QuarrelYard));
+
+            var peopleChanged = false;
+            for (var i = 0; i < 12 && ActivityOf(school, first.Id) == TalkActions.QuarrelYard; i++)
+            {
+                peopleChanged |= school.Tick(0.2d, 5d);
+            }
+
+            Assert.True(peopleChanged);
+            Assert.True((OpinionStore.Get(first, second.Id) ?? 0) < baseline);
+        }
+    }
+
+    [Fact]
+    public void BullyPickingAVictim_DirtiesRosterSoSaveKeepsTheId()
+    {
+        var (school, first, second) = TwoPupilsOnBreak();
+        using (school)
+        {
+            GiveTrait(school, first.Id, "Bully");
+            var bully = school.Roster!.People.First(person => person.Id == first.Id);
+            var other = school.Roster.People.First(person => person.Id == second.Id);
+            OpinionStore.Set(bully, other.Id, -55);
+            OpinionStore.Set(other, bully.Id, -55);
+            PlaceAt(school, bully.Id, "yard");
+            PlaceAt(school, other.Id, "yard");
+            school.RosterTalkDirty = false;
+
+            Assert.True(school.TryStartAction(bully.Id, TalkActions.QuarrelYard));
+            Assert.NotNull(bully.BullyVictimId);
+            Assert.True(school.RosterTalkDirty);
+        }
+    }
+
     [Fact]
     public void Apology_RaisesOpinion_ButNotAbovePreQuarrel()
     {