chore: pre-release polish (filename, versioned user-agent, SD parser pragmas)

src/Daqifi.Core/Device/SdCard/SdCardCsvFileParser.cs

@@ -249,6 +249,7 @@ private static int FindDataStartIndex(List<string> lines)
         return lines.Count;  // No data found
     }
 
+#pragma warning disable CS1998 // Async iterator: yield return requires async; method has no real awaits.
     private static async IAsyncEnumerable<SdCardLogEntry> ParseCsvLines(
         List<string> lines,
         int dataStartIndex,
@@ -316,9 +317,8 @@ private static async IAsyncEnumerable<SdCardLogEntry> ParseCsvLines(
 
         // Final progress report
         progress?.Report(new SdCardParseProgress(bytesRead, totalBytes, linesProcessed));
-
-        await Task.CompletedTask; // keep the method async-compatible
     }
+#pragma warning restore CS1998
 
     /// <summary>
     /// Parses a firmware CSV data row with interleaved per-channel timestamp/value pairs.
@@ -472,9 +472,10 @@ private static long ComputeTickDelta(uint previous, uint current)
         return (long)(uint.MaxValue - previous) + current + 1;
     }
 
+#pragma warning disable CS1998 // Async iterator: yield break requires async; no real awaits.
     private static async IAsyncEnumerable<SdCardLogEntry> EmptySamples()
     {
-        await Task.CompletedTask;
         yield break;
     }
+#pragma warning restore CS1998
 }

src/Daqifi.Core/Device/SdCard/SdCardFileParser.cs

@@ -210,6 +210,7 @@ private static async Task<List<DaqifiOutMessage>> ReadAllMessagesAsync(
         return messages;
     }
 
+#pragma warning disable CS1998 // Async iterator: yield return requires async; method has no real awaits.
     /// <summary>
     /// Produces <see cref="SdCardLogEntry"/> samples from the parsed messages.
     /// </summary>
@@ -327,9 +328,8 @@ private static async IAsyncEnumerable<SdCardLogEntry> ProduceSamples(
 
             yield return new SdCardLogEntry(timestamp, analogValues, digitalData, analogTimestamps);
         }
-
-        await Task.CompletedTask; // keep the method async-compatible
     }
+#pragma warning restore CS1998
 
     /// <summary>
     /// Scales raw ADC integer values using calibration parameters from the device config.

src/Daqifi.Core/Device/SdCard/SdCardJsonFileParser.cs

@@ -98,6 +98,7 @@ public async Task<SdCardLogSession> ParseFileAsync(
         return await ParseAsync(fileStream, Path.GetFileName(filePath), options, ct);
     }
 
+#pragma warning disable CS1998 // Async iterator: yield return requires async; method has no real awaits.
     private static async IAsyncEnumerable<SdCardLogEntry> ParseJsonLines(
         List<string> lines,
         SdCardDeviceConfiguration config,
@@ -162,9 +163,8 @@ private static async IAsyncEnumerable<SdCardLogEntry> ParseJsonLines(
 
         // Final progress report
         progress?.Report(new SdCardParseProgress(bytesRead, totalBytes, linesProcessed));
-
-        await Task.CompletedTask; // keep the method async-compatible
     }
+#pragma warning restore CS1998
 
     private static (uint timestamp, IReadOnlyList<double> analog, uint digital)? TryParseJsonLine(string line)
     {
@@ -332,9 +332,10 @@ private static long ComputeTickDelta(uint previous, uint current)
         return (long)(uint.MaxValue - previous) + current + 1;
     }
 
+#pragma warning disable CS1998 // Async iterator: yield break requires async; no real awaits.
     private static async IAsyncEnumerable<SdCardLogEntry> EmptySamples()
     {
-        await Task.CompletedTask;
         yield break;
     }
+#pragma warning restore CS1998
 }

src/Daqifi.Core/Firmware/GitHubFirmwareDownloadService.cs

@@ -1,4 +1,5 @@
 using System.IO.Compression;
+using System.Reflection;
 using System.Text.Json;
 
 namespace Daqifi.Core.Firmware;
@@ -8,9 +9,21 @@ namespace Daqifi.Core.Firmware;
 /// </summary>
 public sealed class GitHubFirmwareDownloadService : IFirmwareDownloadService
 {
-    private const string DEFAULT_USER_AGENT = "DaqifiFirmwareUpdater/1.0";
+    private static readonly string DEFAULT_USER_AGENT = BuildDefaultUserAgent();
     private const int DOWNLOAD_BUFFER_SIZE = 8192;
 
+    private static string BuildDefaultUserAgent()
+    {
+        // Prefer InformationalVersion so prerelease SemVer suffixes (e.g. "1.0.0-beta.1")
+        // survive into GitHub API traffic for rate-limit/abuse investigations.
+        // AssemblyVersion is numeric-only and would truncate them.
+        var assembly = typeof(GitHubFirmwareDownloadService).Assembly;
+        var version = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion
+                      ?? assembly.GetName().Version?.ToString()
+                      ?? "unknown";
+        return $"DaqifiFirmwareUpdater/{version}";
+    }
+
     private readonly HttpClient _httpClient;
     private readonly string _firmwareRepoApiUrl;
     private readonly string _wifiRepoApiUrl;