Restore outline-regexp pattern for top-level forms

Multiple alternate patterns were previously removed from outline-regexp in
b1ea6de. The pattern restored in this commit is needed to enable top-level forms
to participate in outline-minor-mode.

Adding this pattern back in does not undo the fix intended in b1ea6de.

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Bugs fixed
 
 * [cider#3758](https://github.com/clojure-emacs/cider/issues/3758): Improve regexp for clojure-find-def to recognize more complex metadata on vars
+* [#684](https://github.com/clojure-emacs/clojure-mode/issues/684): Restore `outline-regexp` pattern to permit outline handling of top-level forms.
 
 ## 5.19.0 (2024-05-26)
 

clojure-mode.el

@@ -625,7 +625,7 @@ replacement for `cljr-expand-let`."
   (add-to-list 'imenu-generic-expression '(nil clojure-match-next-def 0))
   (setq-local indent-tabs-mode nil)
   (setq-local paragraph-ignore-fill-prefix t)
-  (setq-local outline-regexp ";;;;* ")
+  (setq-local outline-regexp ";;;;* \\|(") ; comments and top-level forms
   (setq-local outline-level 'lisp-outline-level)
   (setq-local comment-start ";")
   (setq-local comment-start-skip ";+ *")