Integrate the `Decision` agent into the Agent Flow Execution

[mufeedvh]

The Decision agent is the most powerful agent in the execution flow with the ability to chain multiple commands to complete a certain task, including the ability to clone a GitHub repo, fix bugs in it, and make a PDF report of the entire process in a single shot.

This agent is currently not integrated into the agent flow. This should be implemented in src/agents/agent.py.

[SuibhneOFoighil]

Just double checking, we should add Decision agent to execute (here)