session 0: success in 6.5s, $0.0421
session 1: success in 7.2s, $0.0421
session 2: success in 6.3s, $0.0420

3 sessions in parallel: wall=7.2s, peak claude processes=4, peak total RSS=1074 MiB (~268 MiB per session)
planning: agents per host = (host RAM - overhead) / per-session ceiling; at ~268 MiB a 16 GiB host fits ~53 idle-sized sessions