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/TestFixtures.cs

@@ -13,10 +13,15 @@ public static class TestFixtures
     /// 两行 Ploss 记录（header + FOD 16 字段）。
     /// 默认值让恒等式成立（Field5 - Field4 - PowLoss - ploss == DeltaP）且余量 > 2000。
     /// </summary>
+    /// <param name="Field1AsHex">
+    /// 当不为 null 时，覆写 Field1，按十六进制字面量写入日志（如 "0C" = 十进制 12），
+    /// 用于验证解析器对 Field1 十六进制格式的支持。
+    /// </param>
     public sealed record PlossTwoLineRow(
         int PowLoss = 2200,
         int DeltaP = 2500,
         int Field1 = 1,
+        string? Field1AsHex = null,
         int Field2 = 0,
         int Field3 = 0,
         int Field4 = 800,   // RX power
@@ -41,8 +46,9 @@ public static class TestFixtures
         foreach (var r in rows)
         {
             lines.Add($"pow_loss = {r.PowLoss}, delta_p = {r.DeltaP}");
+            var field1 = r.Field1AsHex ?? r.Field1.ToString();
             lines.Add(
-                $"FOD-> {r.Field1} {r.Field2} {r.Field3} {r.Field4} {r.Field5} {r.Field6} " +
+                $"FOD-> {field1} {r.Field2} {r.Field3} {r.Field4} {r.Field5} {r.Field6} " +
                 $"{r.Field7} {r.Field8} {r.Field9} {r.Field10} {r.Field11} {r.Field12} " +
                 $"{r.Field13} {r.Field14} {r.Field15} {r.Field16}");
         }
@@ -51,11 +57,18 @@ public static class TestFixtures
     }
 
     /// <summary>写旧单行格式 Ploss 日志（14 字段），仅指定 ploss/threshold/FOD 三个关键字段。</summary>
-    public static string WriteLegacyPlossLog(string dir, string fileName, params (int Ploss, int Threshold, int Fod)[] rows)
+    /// <param name="rows">每行 FOD 记录关键字段（ploss/threshold/FOD）</param>
+    /// <param name="field1Hex">若非 null 则覆盖首字段为十六进制字面量（否则固定为 "1"）。</param>
+    public static string WriteLegacyPlossLog(
+        string dir,
+        string fileName,
+        (int Ploss, int Threshold, int Fod)[] rows,
+        string? field1Hex = null)
     {
         var path = Path.Combine(dir, fileName);
+        var head = field1Hex ?? "1";
         var lines = rows
-            .Select(r => $"FOD-> 1 0 0 0 0 0 0 0 {r.Ploss} {r.Threshold} 0 {r.Fod} 0 0")
+            .Select(r => $"FOD-> {head} 0 0 0 0 0 0 0 {r.Ploss} {r.Threshold} 0 {r.Fod} 0 0")
             .ToArray();
         File.WriteAllLines(path, lines);
         return path;