Add PATH command lookup and improve command handling logic

pshell.pl

@@ -60,20 +60,17 @@ while (1) {
     # Skip empty commands
     next unless length $command;
     
-    # Try custom commands first
+    # Handle command
     my $cmd_status = CustomCommands::handle($command, $env);
-    if ($cmd_status == 1) {
-        next;
-    }
-    elsif ($cmd_status == -1) {
-        print "Command not found: $command\n";
+    if ($cmd_status >= 0) {  # 1=handled, 2=system command
+        # Save valid commands to history
+        $history->add($command);
+        $term->addhistory($command);
         next;
     }
     
-    # Save command to history
-    $history->add($command);
-    $term->addhistory($command);
-    
-    # Execute command
-    system($command);
+    # Command not found
+    #print STDERR "DEBUG: Main program detected command not found\n";
+    print "Command not found: $command\n";
+    next;
 }