Code auditing mode.

Workflow:

1. Look at some code. If it's fine, run M-x audit-ok. This makes it go green.
2. If there is a problem with some code, run M-x audit-comment. Write a comment in the minibuffer and then you'll see an overlay of that comment in the file.

A populated file, with both comments and good code looks like:

You can delete any audit section by going to it and running M-x audit-delete.

Run audit-refresh if you open a file and you don't see audit overlays.

Switch to your project root directory and run M-x audit-status. You will get a buffer *audit-status*. Here is an example:

You can edit audit comments by going to the comment and hitting e.