Supervisor agent

[hanna-paasivirta]

Short Description

Global agent that can call tools and subagents (subagents implemented later).

Fixes #333

Implementation Details

A more detailed breakdown of the changes, including motivations (if not provided in the issue).

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[josephjclark]

Some requests!

1. A simple test that I (or someone else) can run which asks the same question to a) the existing workflow chat and b) the global assistant, and allow me to compare answers
2. A readout here of the approximate token overhead of of the global assistant. Like if the workflow service today costs 10k tokens per query, how many tokens for the same query in the global assistant? This before any optimisation - I want a baseline number that we can work with

[hanna-paasivirta]

At this stage, we've plugged in the workflow agent and can get a similar answer via the supervisor and the original standalone workflow_chat service. For a simple task that only requires one pass through the workflow agent, the token consumption increase in the agentic version is 2x input tokens and 3x output tokens (maybe an underestimate, given the basic prompt of the supervisor). This is our baseline cost without any optimisations.