Independent contributions (i.e. individual pull requests) from anyone other than 'Isaac Turci @Zac8668' are dual-licensed as Polyform NonCommercial (granted to Spicy Lobster & Isaac Turci as the licensor) and Apache 2.0, meaning all independent contributors retain ownership of their own contributions, albeit non-exclusively.
In other words, your contributions belong equally to the Astratomic project as they do to you.