fix: remove PATH from dangerous env vars to preserve shell functionality

- Remove PATH from DANGEROUS_ENV_VARS as it breaks basic commands like ls
- Rely on existing validateCommandAST for security instead
- Maintains usability while preventing library injection attacks

Author: zenyr

packages/pty-manager/src/process.ts

@@ -32,7 +32,6 @@ const DANGEROUS_ENV_VARS = [
   "PERL5LIB",
   "RUBYLIB",
   "CLASSPATH", // Java
-  "PATH", // Potentially dangerous if manipulated
 ];
 
 /**