Build initial MCP SSH server

src/McpSsh.Server/Ssh/RemoteShellCommand.cs

@@ -0,0 +1,36 @@
+using System.Text;
+
+namespace McpSsh.Server.Ssh;
+
+public static class RemoteShellCommand
+{
+    public static string Build(string command, string? cwd)
+    {
+        if (string.IsNullOrWhiteSpace(cwd))
+        {
+            return command;
+        }
+
+        return $"cd {Quote(cwd)} && {command}";
+    }
+
+    public static string Quote(string value)
+    {
+        var builder = new StringBuilder(value.Length + 2);
+        builder.Append('\'');
+        foreach (var character in value)
+        {
+            if (character == '\'')
+            {
+                builder.Append("'\\''");
+            }
+            else
+            {
+                builder.Append(character);
+            }
+        }
+
+        builder.Append('\'');
+        return builder.ToString();
+    }
+}