feat(parser): 支持 Ploss Field1 十六进制解析

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/Gpulse.WCT.DataAnalyzer.Tests/Commands/ParseCommandTests.cs

@@ -76,6 +76,30 @@ public class ParseCommandTests : CommandTestBase
         Assert.That(await Host.LocalDb.PlossRecords.CountAsync(), Is.EqualTo(2));
     }
 
+    [TestCase("0C",   12)]    // 上位 nibble = 0，下位 nibble = C
+    [TestCase("0xFF", 255)]   // 标准 0x 前缀
+    [TestCase("0xff", 255)]   // 小写 hex
+    [TestCase("0A",   10)]
+    [TestCase("0",    0)]     // 纯 0：应识别为十进制 0
+    [TestCase("10",   10)]    // 纯十进制：应识别为 10（不是 0x10 = 16）
+    public async Task Parse_File_PlossLog_HexField1_DecodedCorrectly(string field1Raw, int expected)
+    {
+        var dir = NewDir();
+        var file = TestFixtures.WritePlossLog(dir, TestFixtures.PlossFileName,
+            new TestFixtures.PlossTwoLineRow(Field1AsHex: field1Raw));
+
+        var (code, stdout, _) = await Parse().RunCaptureAsync("--file", file);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(code, Is.EqualTo(0));
+            Assert.That(stdout, Does.Contain("Ploss: 1"));
+        });
+
+        var record = await Host.LocalDb.PlossRecords.SingleAsync();
+        Assert.That(record.Field1, Is.EqualTo(expected));
+    }
+
     [Test]
     public async Task Parse_File_WithForceOption_Accepted()
     {