Add gitignored data/ directory with .gitkeep structure so anyone
cloning the repo knows exactly where to place model weights and
kernels. Configs now use repo-relative paths — symlink or populate
data/ locally.
data/models/gemma3/27b/ ← model weights
data/models/gemma3/1b/ ← lightweight model
data/safetensors/gemma-3/ ← raw checkpoints
data/kernels/ ← LEK kernel files
Co-Authored-By: Virgil <virgil@lethean.io>
