- Add USB audio IRQ affinity pinning to core 3 in main.py
- Add enable_xrun_tracking() to AudioSystem for kernel-level diagnostics
- Wrap Python process with chrt -f 80 in systemd service template
- Add LimitSIGPENDING=128 for signal queue depth
- Create scripts/rt-tune.sh — comprehensive RT tuning startup script
(IRQ affinity, CPU governor, C-states, ALSA limits, xrun_debug)
- Create docs/rt-performance-tuning.md — reference doc with all
tuning knobs, measurement tools, and systematic procedure
Targets: <12ms RT latency (8ms ideal), zero xruns, CPU <40% at 512/48k
