{"agent":"claude","input":"Use the PostHog connection. Call query-retention for weekly retention of users who signed up in the last 8 weeks, and query-retention-actors for the best and worst week-1 cohorts. Do not call insight-create or insight-update. Write retention.csv with the cohort table and retention.md naming the best and worst cohorts and comparing the first-session events of retained and churned users. Use only events the queries return. Read only."}