To tune auto-fill-mode (and manual fill invocation with M-q etc) you can set the fill-column variable. You can set it globally, per-mode (using mode hooks) or even per-buffer (manually or using file-local variables).
When thinking about line breaks in Emacs it’s important to consider if you want visual line breaks that only affect display or actual line breaks that also appear in the file as newline characters.






















Not sure how the typical user would go about it but as an Emacs user I’d yank the text into an Emacs buffer and hit
C-x =on the characters to identify them.