Ubuntu VM102 8-vCPU software encoder tuning (2026-11-06)

Applied and verified:
- Sunshine capture: kms
- encoder: software (libx264)
- fps: 45 (was 30)
- bitrate: 30000 kbps (was 20000)
- sw_thread_count: 4 (was 2)
- user service CPUAffinity: 2-5 (was 2 3)
- sunshine process restarted and running; /proc affinity confirms 2-5

Box ticket already aligned:
- desk-ubuntu-01 / 192.168.1.72
- 2560x1440, 45 FPS, 30 Mbps

Backup on guest:
- /home/test2/.config/sunshine/backups/8vcpu-45fps-20261106/

Caveat:
- VM has 8 vCPU but host has 4 physical cores; this is an A/B trial, not a claim of 45 FPS or Windows equivalence.
- Reconnect Ubuntu and measure actual dynamic FPS plus drag/click P95. Roll back if frame pacing or tail latency worsens.
