docs: correct base_model lineage for HF model tree

HF uses base_model + base_model_relation frontmatter to rank models in
search results and render the model tree widget. The Lemma family's
true lineage is:

google/gemma-4-*-it
└── LetheanNetwork/<m> (finetune — our namespace fork)
└── lthn/<m> (finetune — LEK merged into weights)
└── lthn/<m>-mlx (quantized — mlx 4/8bit/bf16)

Previously this repo had base_model_relation set to quantized, which
was wrong — LEK merging is a finetune, not a quant. Fixing so the
model tree widget ranks the family correctly.

Co-Authored-By: Virgil <virgil@lethean.io>

README.md

@@ -1,7 +1,37 @@
 ---
-language: en
 library_name: mlx
 pipeline_tag: image-text-to-text
 tags:
+- gemma4
+- lemma
 - mlx
+- 8bit
+- apple-silicon
+- multimodal
+- on-device
+- conversational
+license: eupl-1.2
+license_link: https://ai.google.dev/gemma/docs/gemma_4_license
+base_model:
+- lthn/lemma
+base_model_relation: quantized
 ---
+
+# Lemma — Gemma 4 E4B — MLX 8-bit
+
+The mid-sized member of the Lemma model family by Lethean. An EUPL-1.2 fork of Gemma 4 E4B with the Lethean Ethical Kernel (LEK) merged into the weights.
+
+This repo hosts the **MLX 8-bit** build for native Apple Silicon inference via [`mlx-lm`](https://github.com/ml-explore/mlx-lm) and [`mlx-vlm`](https://github.com/Blaizzy/mlx-vlm). For the GGUF playground (Ollama, llama.cpp) see [`lthn/lemma`](https://huggingface.co/lthn/lemma). For the unmodified Google base see [`LetheanNetwork/lemma`](https://huggingface.co/LetheanNetwork/lemma).
+
+## Family
+
+| Repo | Format | Bits |
+|---|---|---|
+| [`lthn/lemma`](https://huggingface.co/lthn/lemma) | GGUF multi-quant | Q4_K_M → BF16 |
+| [`lthn/lemma-mlx`](https://huggingface.co/lthn/lemma-mlx) | MLX | 4-bit |
+| [`lthn/lemma-mlx-8bit`](https://huggingface.co/lthn/lemma-mlx-8bit) | MLX | 8-bit |
+| [`lthn/lemma-mlx-bf16`](https://huggingface.co/lthn/lemma-mlx-bf16) | MLX | bf16 |
+
+## License
+
+EUPL-1.2. See [Gemma Terms of Use](https://ai.google.dev/gemma/docs/gemma_4_license) for upstream base model terms.