Read the exchange boxes a published .udc file actually names

The box names in EntryWindowInfo are N1MM's LogItem.LogItemNameType members.
We read four of them under names that are not in that enum, so a file naming
its section box SectionText got no section box at all, and a zone or a power
box was dropped whatever it was called.

SectionText, CQZoneText and PowerText are now read. SectText stays as well: it
is not one of N1MM's names but files in the wild use it.

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

tests/Nonemm.Contests.Tests/UserDefinedContestTests.cs

@@ -74,4 +74,36 @@ public class UserDefinedContestTests
         log.Add(TestLog.Contact("JA1XYZ"));
         Assert.False(log.Judge(TestLog.Contact("JA1XYZ")).IsDupe);
     }
+
+    /// The box names in a published file are N1MM's `LogItemNameType` members.
+    [Fact]
+    public void TheZoneStateAndPowerBoxesAreRead()
+    {
+        UserDefinedContest contest = new(UdcFile.Parse("""
+            [Contest]
+            Name=BOXTEST
+            EntryWindowInfo=RCVText, 400, CQZoneText, 300, SectionText, 300, PowerText, 300
+            FrameText=RST Zone Sect Pwr
+            """));
+
+        Assert.Equal(
+            [ExchangeSlot.ReceivedReport, ExchangeSlot.Zone, ExchangeSlot.Section, ExchangeSlot.Power],
+            contest.ExchangeFieldsFor(TestLog.Germany).Select(f => f.Slot).ToList());
+    }
+
+    /// The sent-side boxes are in the same setting and are not exchange boxes.
+    [Fact]
+    public void TheSentBoxesAreLeftOutOfTheExchange()
+    {
+        UserDefinedContest contest = new(UdcFile.Parse("""
+            [Contest]
+            Name=SENTTEST
+            EntryWindowInfo=SNTText, 400, SntNrText, 300, RCVText, 400, RcvNrText, 300
+            FrameText=Snt SntNr RST Nr
+            """));
+
+        Assert.Equal(
+            [ExchangeSlot.ReceivedReport, ExchangeSlot.SerialNumber],
+            contest.ExchangeFieldsFor(TestLog.Germany).Select(f => f.Slot).ToList());
+    }
 }