Features
- effectiveness: add real-time session stream for team leads (#222)
- effectiveness: add prompt pattern mining on /org/prompts (#221)
- effectiveness: add session comparison/diff view (#220)
- cost: add model routing simulation on /org/models (#219)
- cost: add per-team cost anomaly detection and alerting (#216)
- security: add secret-exposure alerting and recent-exposures table (#215)