Knowledge system is disabled

[lalalune]

Describe the bug

Currently the knowledge system is disabled
https://github.com/ai16z/eliza/blob/main/core/src/core/runtime.ts#L320

There is a continue. We should remove the continue, test the knowledge system end-to-end with knowledge and verify that it is injected into the context.

[oxSaturn]

Is this issue fixed?

[oxSaturn]

Reckon it's already fixed by #616