Apply code style improvements from review feedback

Address nitpick suggestions to improve code readability and conventions:
- Use LastOrDefault()?.Version instead of indexed access for better idiomatic C#
- Cache Environment.NewLine.Length as static readonly field to avoid repeated property access
- Add System.IO using and use Path.Combine instead of System.IO.Path.Combine for consistency

These changes maintain identical functionality while following C# conventions.

Co-authored-by: jongalloway <[email protected]>

Author: Copilot

DotNetMcp/DotNetCommandExecutor.cs

@@ -11,6 +11,7 @@ namespace DotNetMcp;
 public static class DotNetCommandExecutor
 {
     private const int MaxOutputCharacters = 1_000_000;
+    private static readonly int NewLineLength = Environment.NewLine.Length;
 
     /// <summary>
     /// Execute a dotnet command with full output handling, logging, and truncation support.
@@ -43,7 +44,7 @@ public static async Task<string> ExecuteCommandAsync(string arguments, ILogger?
             if (e.Data != null)
             {
                 // Check if adding this line would exceed the limit
-                int projectedLength = output.Length + e.Data.Length + Environment.NewLine.Length;
+                int projectedLength = output.Length + e.Data.Length + NewLineLength;
                 if (projectedLength < MaxOutputCharacters)
                 {
                     output.AppendLine(e.Data);
@@ -61,7 +62,7 @@ public static async Task<string> ExecuteCommandAsync(string arguments, ILogger?
             if (e.Data != null)
             {
                 // Check if adding this line would exceed the limit
-                int projectedLength = error.Length + e.Data.Length + Environment.NewLine.Length;
+                int projectedLength = error.Length + e.Data.Length + NewLineLength;
                 if (projectedLength < MaxOutputCharacters)
                 {
                     error.AppendLine(e.Data);

DotNetMcp/DotNetResources.cs

@@ -1,3 +1,4 @@
+using System.IO;
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using ModelContextProtocol.Server;
@@ -52,14 +53,14 @@ public async Task<string> GetSdkInfo()
                 {
                     var version = parts[0].Trim();
                     var path = parts[1].TrimEnd(']').Trim();
-                    sdks.Add(new SdkInfo(version, System.IO.Path.Combine(path, version)));
+                    sdks.Add(new SdkInfo(version, Path.Combine(path, version)));
                 }
             }
 
             var response = new
             {
                 sdks,
-                latestSdk = sdks.Count > 0 ? sdks[sdks.Count - 1].Version : null
+                latestSdk = sdks.LastOrDefault()?.Version
             };
 
             return JsonSerializer.Serialize(response, new JsonSerializerOptions { WriteIndented = true });
@@ -99,7 +100,7 @@ public async Task<string> GetRuntimeInfo()
                         var name = nameAndVersion[0];
                         var version = nameAndVersion[1];
                         var path = parts[1].TrimEnd(']').Trim();
-                        runtimes.Add(new RuntimeInfo(name, version, System.IO.Path.Combine(path, version)));
+                        runtimes.Add(new RuntimeInfo(name, version, Path.Combine(path, version)));
                     }
                 }
             }