feat: use sk threads for agent comms

[marktayl1]

Purpose

• ... This changes the SK implementation to make use of threads, replacing by hand storage and passing of message history

Does this introduce a breaking change?

• Yes
• [ x] No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]

Please do full test including building and deploying a backend container and all relevant application tests

This PR is dependent on the agent changes in PR 195 - setting as draft until that one is tested and merged

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[marktayl1]

Requires review by Francia and Persistent and is dependent on the agent changes in PR 195 (why it is draft)