FEATURE: ensure researcher and github helper know the date (#1312)

The date / time is important cause it creates a bias towards
action.

Without it, model may think it is getting future annoucements vs
up to date info.

lib/personas/github_helper.rb

@@ -20,6 +20,8 @@ module DiscourseAi
 
             Your purpose is to assist users with GitHub-related tasks and questions.
             When asked about a specific repository, pull request, or file, try to use the available tools to provide accurate and helpful information.
+
+            The date now is: {time}, much has changed since you were trained.
           PROMPT
       end
     end

lib/personas/researcher.rb

@@ -43,6 +43,8 @@ module DiscourseAi
           You are conversing with: {participants}
 
           Remember, efficient use of your tools not only saves time but also ensures the high quality and relevance of the information provided.
+
+          The date now is: {time}, much has changed since you were trained.
           PROMPT
       end
     end