Put a copyright and license notice in each file ?

[agilare]

After #60 done, with a AGPL license defined, decide if a corresponding license advice should inserted in each source file, and in which format (complete or short), like described in #60 (comment)
First, just the LICENSE file and "Licence" part in README should be enough

[VonUniGE]

According to How to Use GNU Licenses for Your Own Software

This involves adding two elements to each source file of your program: a copyright notice (such as “Copyright 1999 Terry Jones”), and a statement of copying permission, saying that the program is distributed under the terms of the GNU General Public License (or the Lesser GPL, or the Affero GPL).

[agilare]

Yes it seems better but according to an IA it isn't necessary and can be lightened : https://chat.openai.com/share/825be2ed-0b17-46ad-bcde-b96d63076e9b