Langfuse Observability Langfuse is the LLM observability layer for joelclaw. Every LLM call produces a Langfuse trace with nested hierarchy, I/O, usage, cost, and attribution. Architecture joelclaw has two Langfuse integration points : 1. Pi-session extension ( ) - Source : (canonical, git-tracked in this repo) - Runtime : loaded as a pi extension from the same source tree - What it traces : Every gateway + interactive pi session LLM call - How : Hooks into pi session events ( , , , , , ) - Dedup : guard prevents duplicate extension instances - Optional dependency behavior : is lazily loaded…