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+;;; system-lib.el --- System utility library functions -*- lexical-binding: t; -*-
+;;
+;;; Commentary:
+;; This module provides low-level system utility functions for checking
+;; the availability of external programs and system capabilities.
+;;
+;; Functions include:
+;; - Checking if external programs are available in PATH
+;;
+;;; Code:
+
+(defun cj/executable-exists-p (program)
+  "Return non-nil if PROGRAM is available in PATH.
+PROGRAM should be a string naming an executable program."
+  (and (stringp program)
+       (not (string-empty-p program))
+       (executable-find program)))
+
+(provide 'system-lib)
+;;; system-lib.el ends here