Integrate Patter with OpenClaw (brain on the line)

OpenClaw is a self-hosted gateway of LLM-backed agents with scoped tool connections (calendars, customer DBs, …). Patter is the voice layer: it owns the carrier leg, talks with low latency, and reaches into OpenClaw only when a turn needs real data or an action. This is the brain-on-the-line architecture — the inverse of wiring OpenClaw in as a "Custom LLM" that sits on every turn (the topology that kills calls on slow tools).