More support for multi-agentic systems in `effectful`

[kiranandcode]

Having been building more multi-agentic systems in Ceremony using effectful and recently coming across this blog post in HN:

https://rezzed.ai/blog/architecture-review-multi-agent-system

The notes from this blog post seem to match up closely with my experience from Ceremony, and seem like really useful features that would likely be of use across several projects.

At the very least, it would be particularly helpful to have a PersistentAgent subclass that persists state and can be resumed across sessions and also handles compaction of the state.

[datvo06]

For the Persistence Agent, the user could just create a tool to read and write to memory right?
Or the PersistenceAgent would keep track of all of its memory?

[kiranandcode]

@datvo06 I guess the agent's state of the conversation trace should be restored on restart of the agent - I guess this could be a tool on the agent!