Q-02: Agent Harnesses & Models

Which harnesses? Which models? Pre-staged or emergent?

Scope: - Candidate harnesses — Pi agents (Bun), Hermes, OpenCode. Possibly multiple harnesses for different roles. - Runtime — Bun vs installed-on-Bun. Subprocess vs HTTP bridge between Python and Bun. - Extension configs — pre-provided tool stacks or staged with extension configurations? - Model routing — which model for which node type? Single model for prototype, or multiple? - API key management — where keys live, how they’re accessed, per-unit vs per-node routing

Depends on: Q-01 (where agents run), Q-03 (how nodes call agents)