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

@@ -3,25 +3,18 @@ license: eupl-1.2
 pipeline_tag: image-text-to-text
 library_name: mlx
 base_model:
-- LetheanNetwork/lemer
+- lthn/lemer
 base_model_relation: quantized
 tags:
 - gemma4
-- gemma
-- mlx
-- mlx-q4
-- safetensors
-- quantized
-- multimodal
-- vision
-- audio
 - lemma
-- lethean
-- lem
-- lek
+- mlx
+- 4bit
 - apple-silicon
+- multimodal
 - on-device
 - conversational
+license_link: https://ai.google.dev/gemma/docs/gemma_4_license
 ---
 <!--
 This content is subject to the European Union Public Licence (EUPL-1.2).