fix(cli): resolve formatting and platform compatibility issues

- Fix whitespace formatting in RunnerStartCommand lambda
- Guard File.SetUnixFileMode with platform check to fix CA1416

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pksorensen

src/Commands/GitHub/Runner/RunnerStartCommand.cs

@@ -135,7 +135,8 @@ public async Task<int> ExecuteAsync(CommandContext context, Settings settings)
             await using var credentialServer = new GitCredentialServer(
                 _authService,
                 firstRegistration.Id,
-                msg => {
+                msg =>
+                {
                     try { File.AppendAllText(logPath, $"[{DateTime.UtcNow:yyyy-MM-dd HH:mm:ss}] [cred-server] {msg}\n"); } catch { }
                 });
             await credentialServer.StartAsync();

src/Infrastructure/Services/Runner/GitCredentialServer.cs

@@ -73,12 +73,15 @@ public async Task StartAsync(CancellationToken ct = default)
         await _app.StartAsync(ct);
 
         // Make socket world-accessible so container users (e.g. 'node') can connect
-        if (File.Exists(_socketPath))
+        if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
         {
-            File.SetUnixFileMode(_socketPath,
-                UnixFileMode.UserRead | UnixFileMode.UserWrite | UnixFileMode.UserExecute |
-                UnixFileMode.GroupRead | UnixFileMode.GroupWrite | UnixFileMode.GroupExecute |
-                UnixFileMode.OtherRead | UnixFileMode.OtherWrite | UnixFileMode.OtherExecute);
+            if (File.Exists(_socketPath))
+            {
+                File.SetUnixFileMode(_socketPath,
+                    UnixFileMode.UserRead | UnixFileMode.UserWrite | UnixFileMode.UserExecute |
+                    UnixFileMode.GroupRead | UnixFileMode.GroupWrite | UnixFileMode.GroupExecute |
+                    UnixFileMode.OtherRead | UnixFileMode.OtherWrite | UnixFileMode.OtherExecute);
+            }
         }
     }