Custom message conventions with --custom-conventions

[itmustbemagic]

It would be great to have a flag like --custom-conventions that applies custom commit conventions and accepts a stringified JSON formatted object.

Example usage:
--custom-conventions '{"messageSize": "80", "messageStart": "lowercase"}'

These configurations should be added to the AI prompt, so they will be considered.

In some places you have different conventions and those could be applied that way dynamically without the necessity to add features for all of them one by one.

If you are okay with it, I would like to work on it