Add custom campaign roll composer

RpgRoller.Tests/Services/ServiceSkillRollTests.cs

@@ -225,4 +225,43 @@ public sealed class ServiceSkillRollTests
         Assert.False(outsiderPublicDetail.Succeeded);
         Assert.Equal("roll_not_found", outsiderPublicDetail.Error!.Code);
     }
+
+    [Fact]
+    public void CustomRoll_UsesCampaignRuleset_AndAppearsAsCustomRollInLog()
+    {
+        using var harness = ServiceTestSupport.CreateHarness(20);
+        var service = harness.Service;
+
+        service.Register("gm-custom", "Password123", "GM");
+        service.Register("owner-custom", "Password123", "Owner");
+        service.Register("other-custom", "Password123", "Other");
+
+        var gmSession = ServiceTestSupport.GetValue(service.Login("gm-custom", "Password123")).SessionToken;
+        var ownerSession = ServiceTestSupport.GetValue(service.Login("owner-custom", "Password123")).SessionToken;
+        var otherSession = ServiceTestSupport.GetValue(service.Login("other-custom", "Password123")).SessionToken;
+
+        var campaign = ServiceTestSupport.GetValue(service.CreateCampaign(gmSession, "Custom", "dnd5e"));
+        var character = ServiceTestSupport.GetValue(service.CreateCharacter(ownerSession, "Hero", campaign.Id));
+
+        var invalidExpression = service.RollCustom(ownerSession, character.Id, "bad", "public");
+        Assert.False(invalidExpression.Succeeded);
+        Assert.Equal("invalid_expression", invalidExpression.Error!.Code);
+
+        var forbiddenRoll = service.RollCustom(otherSession, character.Id, "1d20+5", "public");
+        Assert.False(forbiddenRoll.Succeeded);
+        Assert.Equal("forbidden", forbiddenRoll.Error!.Code);
+
+        var customRoll = ServiceTestSupport.GetValue(service.RollCustom(ownerSession, character.Id, "1d20+5", "private"));
+        Assert.Equal(Guid.Empty, customRoll.SkillId);
+        Assert.StartsWith("1d20+5 => ", customRoll.Breakdown, StringComparison.Ordinal);
+
+        var logPage = ServiceTestSupport.GetValue(service.GetCampaignLogPage(gmSession, campaign.Id, limit: 5));
+        var entry = Assert.Single(logPage.Entries);
+        Assert.Equal("Custom roll", entry.SkillName);
+        Assert.Equal("Private (GM view)", entry.VisibilityLabel);
+        Assert.Contains("n20", Assert.IsType<string[]>(entry.EventBadges));
+
+        var log = ServiceTestSupport.GetValue(service.GetCampaignLog(ownerSession, campaign.Id));
+        Assert.Equal("Custom roll", Assert.Single(log).SkillName);
+    }
 }