turns out necromancy doesn't have skills to summon anything.
They haven't added summoning yet.
there is also no indication on how to increase this besides increasing level
Putting points in Wits increases Initiative, and there is +Initiative on some gear. It's not much, but it's all there is. Wits is a pretty underwhelming stat as it is currently, so best to get +Initiative gear.
I fully agree with you on the CC issue.