fix: specify T4 GPU in kernel metadata (#18)

Default 'Gpu' machine_shape gives P100 (CUDA 6.0) which is
incompatible with current PyTorch/unsloth (requires 7.0+).

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: nvandessel

notebooks/kernel-metadata.json

@@ -6,6 +6,7 @@
   "kernel_type": "notebook",
   "is_private": true,
   "enable_gpu": true,
+  "machine_shape": "NvidiaTeslaT4Highmem",
   "enable_internet": true,
   "dataset_sources": ["nvandessel/floop-decisions"],
   "competition_sources": [],