[Question] about EPv2 hybrid mode get_theoretical_num_qps

hybrid mode set num_qps to num_sms * 16 + 1, But it seems only `kNumChannelsPerSM` were used and `kNumMaxChannelsPerSM` is 8, So is num_sms * 8 enough?
```
const auto [qp_idx, sharing_mode] = comm::get_qp_mode 0)>(
sm_idx, (warp_idx - kNumNotifyWarps) % kNumChannelsPerSM, warp_idx < kNumNotifyWarps);
const auto gin = handle::NCCLGin(nccl_dev_comm, nccl_window, qp_idx, sharing_mode);
```

Start by tracing get_theoretical_num_qps and the hybrid-mode path that computes num_qps, then compare it with get_qp_mode and NCCLGin in the shown snippet. Determine whether kNumChannelsPerSM or kNumMaxChannelsPerSM defines the required queue-pair count, and document the result with a focused test or reproducible calculation if the repository provides one.

Written by the indexing model from the issue text.