Laguna-S-2.1-GGUF Updates

We updated Laguna GGUFs with the latest official fixes as provided bvy Poolside:

* Default context length reduced from 1M to 262144. Using 1M will need `--ctx-size 1048576 --rope-scaling yarn --rope-scale 128 --yarn-orig-ctx 8192` * `laguna.rope.scaling.yarn_attn_factor` is now 1.0 from before.

See [https://huggingface.co/unsloth/Laguna-S-2.1-GGUF/discussions/19](https://huggingface.co/unsloth/Laguna-S-2.1-GGUF/discussions/19)

This should fix looping, repetition and other issues people reported.