Operator call: an opt-in flag on the one machine we most need data from is the silent-diagnostic mistake this project's doctrine exists to prevent. Every session log now carries [segperf] beside every [rstat] window, so the next playtest gives the 817->857 stall hunt cross-machine baselines for free -- Oracle's stalling rig and Sauron's clean one, same night, same build. Cost: ~2 QPC reads per segment query, microseconds per second. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018SgmXGNMXavXiafKXf9MDC