fix: support Nushell for PATH detection (#272)

Author: leonqadirie

apps/expert/lib/expert/port.ex

@@ -106,6 +106,14 @@ defmodule Expert.Port do
 
           ["-l", "-c", cmd]
 
+        "nu" ->
+          # Nushell stores PATH as a list in $env.PATH, so we join with colons.
+          # Nushell doesn't support && operator, use ; instead.
+          cmd =
+            "cd #{directory}; print $\"#{@path_marker}:($env.PATH | str join \":\"):#{@path_marker}\""
+
+          ["-l", "-c", cmd]
+
         _ ->
           cmd = "cd #{directory} && printf \"#{@path_marker}:%s:#{@path_marker}\" \"$PATH\""
           ["-i", "-l", "-c", cmd]