Default ruby path /usr/bin/ruby fails on Windows, and no message is shown #5

Claude reports:

The default ruby_check_on_save_cmd is /usr/bin/ruby, which does not exist on Windows, and a failed start of Ruby gives no message.

Sublime Text build 4215, Windows, files from the repo master, with the settings-name problem from the other issue patched locally. Saving a .rb file then gave FileNotFoundError: [WinError 2] The system cannot find the file specified in the console only; no dialog or status message. (Ruby is not installed on this machine, so the syntax check itself was not run.)

The same would happen on macOS with Homebrew/rbenv Ruby, where ruby is not at /usr/bin/ruby.

Fix: default to "ruby" (found via PATH) and catch OSError around Popen, showing sublime.error_message that names the setting.