Add a scaling-parameters section to the README covering target_util=1.0
(the critical one — the default 0.9 silently rounds up to one extra
worker), min_load math, and why max_queue_time / target_queue_time
don't matter here (sessions are filtered from wait_time so both signals
stay at zero).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Rob Ballantyne
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