docs(specs): l4d2 server host perf baseline — design
Approach A: per-instance unit directives (Nice, OOM, Memory caps,
KillSignal=SIGINT, log-rate disable), flat l4d2-game/l4d2-build slice
hierarchy with 100:1 CPU/IO weight ratio, sandbox into build slice with
OOMScoreAdjust=500, host sysctls for UDP buffers + netdev backlog/budget
+ vm.swappiness. SCHED_FIFO, CPU governor, CPUAffinity, NIC tuning are
documented escape hatches, not auto-applied.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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