Split out a ChildProcessErrorException class from ChildProcessException.

The former will be for non-zero exit codes, the latter for actual exceptions.

src/core/Processes/ChildProcess.cs

@@ -80,7 +80,7 @@ internal ChildProcess(ChildProcessBuilder builder)
             var code = _process.ExitCode;
 
             _ = throwOnError && code != 0
-                ? _completion.TrySetException(new ChildProcessException($"Process exited with code {code}.", code))
+                ? _completion.TrySetException(new ChildProcessErrorException($"Process exited with code {code}.", code))
                 : _completion.TrySetResult(code);
 
             if (terminal)

src/core/Processes/ChildProcessErrorException.cs

@@ -0,0 +1,27 @@
+namespace Vezel.Cathode.Processes;
+
+public class ChildProcessErrorException : ChildProcessException
+{
+    public int ExitCode { get; }
+
+    public ChildProcessErrorException()
+        : this("An unknown child process error occurred.")
+    {
+    }
+
+    public ChildProcessErrorException(string? message)
+        : base(message)
+    {
+    }
+
+    public ChildProcessErrorException(string? message, int exitCode)
+        : this(message)
+    {
+        ExitCode = exitCode;
+    }
+
+    public ChildProcessErrorException(string? message, Exception? innerException)
+        : base(message, innerException)
+    {
+    }
+}

src/core/Processes/ChildProcessException.cs

@@ -2,10 +2,8 @@ namespace Vezel.Cathode.Processes;
 
 public class ChildProcessException : Exception
 {
-    public int ExitCode { get; }
-
     public ChildProcessException()
-        : this("An unknown child process error occurred.")
+        : this("An unknown child process exception occurred.")
     {
     }
 
@@ -14,12 +12,6 @@ public ChildProcessException(string? message)
     {
     }
 
-    public ChildProcessException(string? message, int exitCode)
-        : this(message)
-    {
-        ExitCode = exitCode;
-    }
-
     public ChildProcessException(string? message, Exception? innerException)
         : base(message, innerException)
     {