Add the session, radio control, bandmap and cluster

Nonemm.Session holds what the operator is typing, what the log says about it and
what happens on Enter, with no UI toolkit behind it. Nonemm.Rig talks to
hamlib's rigctld and reconnects on its own. Nonemm.Spotting reads DX cluster
lines into a bandmap that drops spots after an hour.

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

tests/Nonemm.Spotting.Tests/BandmapTests.cs

@@ -0,0 +1,61 @@
+using Nonemm.Core;
+
+namespace Nonemm.Spotting.Tests;
+
+public class BandmapTests
+{
+    private static readonly DateTime Now = new(2026, 5, 30, 12, 0, 0, DateTimeKind.Utc);
+
+    private static Spot At(string call, double kilohertz, DateTime? at = null) =>
+        new(Callsign.Parse(call), Frequency.FromKilohertz(kilohertz), at ?? Now, SpotSource.Cluster);
+
+    [Fact]
+    public void SpotsComeBackInFrequencyOrder()
+    {
+        Bandmap map = new();
+        map.Add(At("DL1ABC", 14_100));
+        map.Add(At("JA1XYZ", 14_010));
+        Assert.Equal(["JA1XYZ", "DL1ABC"], map.On(Bands.Band20M).Select(s => s.Call.Text));
+    }
+
+    [Fact]
+    public void AStationThatMovesKeepsOneEntryOnItsBand()
+    {
+        Bandmap map = new();
+        map.Add(At("DL1ABC", 14_010));
+        map.Add(At("DL1ABC", 14_020));
+        Spot only = Assert.Single(map.On(Bands.Band20M));
+        Assert.Equal(14_020_000, only.Frequency.Hertz);
+    }
+
+    [Fact]
+    public void TheSameStationOnAnotherBandIsASeparateEntry()
+    {
+        Bandmap map = new();
+        map.Add(At("DL1ABC", 14_010));
+        map.Add(At("DL1ABC", 7_010));
+        Assert.Equal(2, map.All().Count);
+    }
+
+    [Fact]
+    public void SpotsOlderThanAnHourAreDropped()
+    {
+        Bandmap map = new();
+        map.Add(At("DL1ABC", 14_010, Now.AddHours(-2)));
+        map.Add(At("JA1XYZ", 14_020, Now.AddMinutes(-5)));
+        map.DropOlderThan(Now);
+        Assert.Equal("JA1XYZ", Assert.Single(map.All()).Call.Text);
+    }
+
+    [Fact]
+    public void TheNearestSpotInsideTheWindowIsFound()
+    {
+        Bandmap map = new();
+        map.Add(At("DL1ABC", 14_010));
+        map.Add(At("JA1XYZ", 14_050));
+        Assert.Equal(
+            "DL1ABC",
+            map.Near(Frequency.FromKilohertz(14_010.2), Frequency.FromKilohertz(0.5))?.Call.Text);
+        Assert.Null(map.Near(Frequency.FromKilohertz(14_030), Frequency.FromKilohertz(0.5)));
+    }
+}

tests/Nonemm.Spotting.Tests/Nonemm.Spotting.Tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Nonemm.Spotting\Nonemm.Spotting.csproj" />
+    <ProjectReference Include="..\..\src\Nonemm.Core\Nonemm.Core.csproj" />
+  </ItemGroup>
+
+</Project>

tests/Nonemm.Spotting.Tests/SpotLineTests.cs

@@ -0,0 +1,34 @@
+using Nonemm.Core;
+
+namespace Nonemm.Spotting.Tests;
+
+public class SpotLineTests
+{
+    private static readonly DateTime Now = new(2026, 5, 30, 12, 40, 0, DateTimeKind.Utc);
+
+    [Fact]
+    public void ANodeSpotIsReadIntoItsParts()
+    {
+        Spot? spot = SpotLine.Parse(
+            "DX de W3LPL:     14025.0  DL1ABC       CW 20 dB 25 WPM CQ             1234Z",
+            Now);
+
+        Assert.NotNull(spot);
+        Assert.Equal("DL1ABC", spot.Call.Text);
+        Assert.Equal(14_025_000, spot.Frequency.Hertz);
+        Assert.Equal("W3LPL", spot.Spotter);
+        Assert.Equal(new DateTime(2026, 5, 30, 12, 34, 0, DateTimeKind.Utc), spot.AtUtc);
+        Assert.DoesNotContain("1234Z", spot.Comment);
+    }
+
+    [Fact]
+    public void OtherTrafficIsNotASpot() =>
+        Assert.Null(SpotLine.Parse("WWV de VE7CC <18Z> : SFI=142, A=7, K=2", Now));
+
+    [Fact]
+    public void ASpotTimedAfterNowCameInYesterday()
+    {
+        Spot? spot = SpotLine.Parse("DX de W3LPL: 14025.0 DL1ABC CQ 2350Z", Now);
+        Assert.Equal(new DateTime(2026, 5, 29, 23, 50, 0, DateTimeKind.Utc), spot?.AtUtc);
+    }
+}