feat: ensure config directory exists before writing config files

Author: msanatan

MCPForUnity/Editor/Helpers/McpConfigurationHelper.cs

@@ -118,6 +118,7 @@ public static string WriteMcpConfiguration(string pythonDir, string configPath,
 
             string mergedJson = JsonConvert.SerializeObject(existingRoot, jsonSettings);
 
+            McpConfigFileHelper.EnsureConfigDirectoryExists(configPath);
             McpConfigFileHelper.WriteAtomicFile(configPath, mergedJson);
 
             try
@@ -183,6 +184,7 @@ public static string ConfigureCodexClient(string pythonDir, string configPath, M
 
             string updatedToml = CodexConfigHelper.UpsertCodexServerBlock(existingToml, uvPath, serverSrc);
 
+            McpConfigFileHelper.EnsureConfigDirectoryExists(configPath);
             McpConfigFileHelper.WriteAtomicFile(configPath, updatedToml);
 
             try