There is a readme File in your Discovery Folder, which has the current story in it Vasuv.
And even if Magellan wasn't listed as ZoI for Gallia, a little logical thinking and general RP background should also give you a good guess where it's alright to engage and where not.
It's not all black and white all the time, even if the ZoI are listed, there should still be flexibility with those issues.
