fix: ignore valueless --config in init:agent

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: DavertMik

lib/command/initAgent.js

@@ -154,7 +154,7 @@ function writeMcpFile(file, agent, env) {
 }
 
 function configEnv(config, cwd) {
-  let configFile = config ? path.resolve(cwd, config) : findConfigFile(getTestRoot())
+  let configFile = typeof config === 'string' ? path.resolve(cwd, config) : findConfigFile(getTestRoot())
   if (configFile && fs.existsSync(configFile) && fs.lstatSync(configFile).isDirectory()) configFile = findConfigFile(configFile)
   if (!configFile || configFile === path.join(cwd, 'codecept.conf.js')) return null
   const relative = path.relative(cwd, configFile)