feat(tcmu): support multi-vCPU backends with Photon v0.9 - #458

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

qd1-j1 iops 15,563 -> 15,481 baseline ratio 0.99, latency 40 us -> 40 us; qd4-j2 iops 69,487 -> 68,767 baseline ratio 0.99, latency 93 us -> 94 us; qd8-j4 iops 101,408 -> 99,749 baseline ratio 0.98, latency 289 us -> 294 us; qd16-j4 iops 12,635 -> 108,671 baseline ratio 8.60, latency 5,039 us -> 564 us; qd32-j4 iops 10,822 -> 78,545 baseline ratio 7.26, latency 11,806 us -> 1,604 us; qd64-j4 iops 7,324 -> 57,847 baseline ratio 7.90, latency 34,921 us -> 4,394 us

AVX-512 accelerated linearized B+tree search not observed