fix: the regex

Signed-off-by: exploreriii <133720349+exploreriii@users.noreply.github.com>

Author: exploreriii

.github/scripts/bot-gfi-assign-on-comment.js

@@ -11,12 +11,12 @@ const UNASSIGNED_GFI_SEARCH_URL =
 /// HELPERS FOR ASSIGNING ///
 
 /**
- * Returns true if /assign appears in comment
+ * Returns true if /assign appears as a standalone command in the comment
  */
 function commentRequestsAssignment(body) {
     const matches =
         typeof body === 'string' &&
-        /\b\/assign\b/i.test(body);
+        /(^|\s)\/assign(\s|$)/i.test(body);
 
     console.log('[gfi-assign] commentRequestsAssignment:', {
         body,