Radicle: peer-to-peer collaboration with Git

1. It would not be handled at all. The commit message is just immutable data. So, unless you functionalize it again by defining special syntax and semantics that interprets "Reported-by: " content, it would not be replaced by anything in the future.

2. All content inside commit messages is handled as described in 1. It could be considered a widespread mis-use of commit messages to bake ill-defined semantics into them and apply social norms on top. That is not what they are supposed to be used for or what their data model can meaningfully support. This means they will always break current or future social norms one way or another.