test: Add Lisp-style comment tests to file watcher

tests/fixtures/watch.lisp

@@ -0,0 +1,19 @@
+(defun hello-world ()
+  ;; ai this is a simple hello world function
+  (format t "Hello, World!"))
+
+(defun add (a b)
+  ; ai! fix this function to handle nil values
+  (+ a b))
+
+(defun multiply (a b)
+  ;;; ai? why is this function not working with large numbers?
+  (* a b))
+
+; ai this is a single semicolon comment
+
+;; ai this is a double semicolon comment
+
+;;; ai this is a triple semicolon comment
+
+;;;; ai! this is a quadruple semicolon comment