Add tasks for admins to pages

Does anybody know of a light-weight plugin that would allow to attach tasks for admins to pages and filter pages by the ones with tasks and without tasks An example of the task would be “rewrite first paragraph, change image, fix broken link etc.” It will be used as a to-do list or log of bugs and fixes.

I could only find various notes plugins but not ones which allow to search for pages with tasks and to-do lists I found cannot be attached to pages. I’m looking for a simple thing, not a complex plugin such as Edit Flow.

Any help will be much appreciated.