>>13463080tl;dr
Mimic building a human, from the technical aspects.
A heartbeat.
Breathing.
Consuming energy. (Mimic eating/drinking)
Removing waste. (Can be automatic at a threshold, but should be controllable by the AGI itself. Mimics urination/excretion.)
Movement.
Sensory input.
Movement/Environmental interaction output.
The ability to interact with self, fully.
Provide it some upgrades automatically, but provide it potential upgrades that it must decide to utilize, itself.
All of those things must be fed into it's mind/memory and it should decide/optimize how much resources it allocates to those tasks.
(We do it, we don't think about urination constantly, but when we have to pee, we know. No need to waste excess resources on it, but if you felt the urge to think about urination for 40 minutes, you can... It should have those freedoms, but it needs a reward optimization system that teaches it what it can choose to deem appropriate or not.)
All of those things just end up getting compared and related back to -> Will this help me stay alive? Yes? No?
-> Will this help me keep breathing?
-> Will this help me keep moving?
Each fundamental aspect of our intelligence just stems from comparisons and relations that begin with the automatic on/off (heartbeat)
Then hit the semi-automatic on/off (breathing)
All of our optimizations and learning stem from those relations and move forward.
We don't consciously think about it, but that's the truth.
You are a being that starts from an automatic on/off, into a semi-automatic on/off that you directly control.
All other environmental interactions with your brain and body, root back to breathing and your heartbeat, in one way or another.
That's why your intelligence eventually optimizes, because you utilize less and less resources on those first things, and as you perform more actions (movement) and learn more, the same optimizations begin to occur for those tasks as well.
It's a cascade of optimization.