Read the rest of what a .udc file says, and score what N1MM scores

Two pieces of work on the scoring engine.

The .udc reader now takes N1MM's published scoring vocabulary: the full
PointsPerContact condition set, the PointsMultBy family, PowerMult, BonusPoints,
the multiplier sources and the settings that say which stations bring a
multiplier in. MultMult is a weight rather than a switch, as in N1MM's
ComputeScore. The entry categories and the sent exchange reach the rules in a
new ContestEntry, so a contest can score by the power category it is entered in
or by what this station sends.

Then every contest in a real N1MM log was scored again from these rules and
compared with the points and multiplier flags N1MM wrote. That found five bugs:
ARRL DX and IARU read the exchange from the wrong column, a stored " " was read
as a value rather than as empty, CQ WW RTTY's own Canadian area names were not
counted, a maritime mobile scored nothing, and a contact in a mode the contest
does not run scored as if it were in the contest.

docs/n1mm-interop.md has the check and what still differs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RoGtneMQaz4M9w7Kk49AVD

tests/Nonemm.Contests.Tests/CqWorldWideRttyTests.cs

@@ -90,4 +90,24 @@ public class CqWorldWideRttyTests
         Assert.Equal(ExchangeSlot.Section, fields[2].Slot);
         Assert.False(fields[2].IsRequired);
     }
+
+    /// The Canadian areas this contest counts are its own list, which splits
+    /// Newfoundland from Labrador.
+    [Theory]
+    [InlineData("NF")]
+    [InlineData("LB")]
+    public void TheContestsOwnCanadianAreasCount(string area) =>
+        Assert.Contains(
+            LogFor(TestLog.Germany).Judge(Contact("VO1XYZ", 5, area)).NewMultipliers,
+            m => m.Index == 3 && m.Value == area);
+
+    /// A maritime mobile station belongs to no country. CQ WW counts it for the
+    /// zone alone, and the contact still scores by continent.
+    [Fact]
+    public void MaritimeMobileScoresButBringsNoCountry()
+    {
+        Verdict verdict = LogFor(TestLog.Germany).Judge(Contact("IK2XYZ/MM", 15));
+        Assert.Equal(2, verdict.Points);
+        Assert.DoesNotContain(verdict.NewMultipliers, m => m.Index == 2);
+    }
 }