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/CqWpxTests.cs

@@ -66,4 +66,16 @@ public class CqWpxTests
         ContestLog log = LogFor(TestLog.Germany);
         Assert.Empty(log.Judge(TestLog.Contact("DL1ABC/MM")).NewMultipliers);
     }
+
+    /// A tuning carrier logged by accident, or any contact in a mode the
+    /// contest does not run, scores nothing. The prefix still counts, which is
+    /// what N1MM logs.
+    [Fact]
+    public void AContactInAnotherModeScoresNothingAndKeepsItsMultiplier()
+    {
+        ContestLog log = new(new CqWpx(ModeCategory.Phone), TestLog.Germany, TestLog.CountryFile);
+        Verdict verdict = log.Judge(TestLog.Contact("IK2XYZ", mode: Modes.Rtty, number: 5));
+        Assert.Equal(0, verdict.Points);
+        Assert.Single(verdict.NewMultipliers);
+    }
 }