Focused Signals scout for PostHog projects using AI observability. Watches `$ai_generation`, `$ai_evaluation`, `$ai_trace` and related events for cost spikes, latency drift, eval pass-rate drops, runaway loops, and error rates. Emits findings only when they clear the confidence bar; otherwise writes durable memory and closes out empty. Self-contained peer in the signals-scout-* fleet — no dependen
