8978e9ae 

Add a type for `Dependencies`

It’s just a `Map`, but it gets used often enough that it makes sense.
Time to Start Worker time Duration Time to finish
Config 0s 1s 1s 2s
Eval 3s 6s 6s 9s
Build 10s 1m11s 1m15s 1m26s
Suite 0s 1m19s 1m25s 1m26s