GPU tuning: @spaces.GPU duration 90->60, max_new_tokens 768->320, remove diagnostic logging

Shim legacy generation output classes so the mamba-ssm hub kernel imports on transformers 5.x

Nemotron-3-Nano fast Mamba path: native NemotronH (transformers>=5.8) + hub kernels, drop mamba_ssm wheel (fixes NVML fork assert)

Load Nemotron on CPU, move to GPU inside @spaces.GPU (fixes NVML fork assert)

Disable Nemotron thinking (enable_thinking=False) so the dispatcher emits clean JSON

Deploy Mumbai Local Panic — Nemotron(ZeroGPU) dispatcher + VoxCPM2 voice