Add the core, contest, storage and format layers

Frequencies, bands, modes, callsigns, grid squares and the country file live in
Nonemm.Core. Nonemm.Contests holds the scoring engine and CQ WW and CQ WPX.
Nonemm.Storage writes N1MM's DXLOG schema, and Nonemm.Formats writes Cabrillo
3.0 and reads and writes ADIF.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/Nonemm.Contests.Tests/CqWpxTests.cs

@@ -0,0 +1,69 @@
+using Nonemm.Contests.Rules;
+using Nonemm.Core;
+
+namespace Nonemm.Contests.Tests;
+
+public class CqWpxTests
+{
+    private static ContestLog LogFor(StationInfo me, ModeCategory mode = ModeCategory.Cw) =>
+        new(new CqWpx(mode), me, TestLog.CountryFile);
+
+    [Theory]
+    [InlineData(14_025, 3)]
+    [InlineData(21_025, 3)]
+    [InlineData(7_025, 6)]
+    [InlineData(3_525, 6)]
+    public void DifferentContinentDoublesBelowFourteenMegahertz(double kilohertz, int expected)
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal(expected, log.Judge(TestLog.Contact("JA1XYZ", kilohertz)).Points);
+    }
+
+    [Fact]
+    public void SameContinentScoresOneOnTheHighBands()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal(1, log.Judge(TestLog.Contact("IK2XYZ")).Points);
+        Assert.Equal(2, log.Judge(TestLog.Contact("IK2XYZ", 7_025)).Points);
+    }
+
+    [Fact]
+    public void NorthAmericansScoreDoubleWithinNorthAmerica()
+    {
+        ContestLog log = LogFor(TestLog.UnitedStates);
+        Assert.Equal(2, log.Judge(TestLog.Contact("VE3XYZ")).Points);
+        Assert.Equal(4, log.Judge(TestLog.Contact("VE3XYZ", 7_025)).Points);
+    }
+
+    [Fact]
+    public void OwnCountryScoresOneOnEveryBand()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Equal(1, log.Judge(TestLog.Contact("DL9XYZ")).Points);
+        Assert.Equal(1, log.Judge(TestLog.Contact("DL9XYZ", 3_525)).Points);
+    }
+
+    [Fact]
+    public void RttyScoresOwnCountryTwiceOnTheLowBands()
+    {
+        ContestLog log = LogFor(TestLog.Germany, ModeCategory.Digital);
+        Assert.Equal(1, log.Judge(TestLog.Contact("DL9XYZ", mode: Modes.Rtty)).Points);
+        Assert.Equal(2, log.Judge(TestLog.Contact("DL9XYZ", 3_525, Modes.Rtty)).Points);
+    }
+
+    [Fact]
+    public void PrefixCountsOnceForTheWholeContest()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        log.Add(TestLog.Contact("JA1XYZ"));
+        Assert.Empty(log.Judge(TestLog.Contact("JA1ZZZ", 7_025)).NewMultipliers);
+        Assert.Single(log.Judge(TestLog.Contact("JA2ZZZ", 7_025)).NewMultipliers);
+    }
+
+    [Fact]
+    public void MaritimeMobileBringsNoPrefix()
+    {
+        ContestLog log = LogFor(TestLog.Germany);
+        Assert.Empty(log.Judge(TestLog.Contact("DL1ABC/MM")).NewMultipliers);
+    }
+}