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

@@ -3,19 +3,19 @@ license: eupl-1.2
 pipeline_tag: image-text-to-text
 library_name: gguf
 base_model:
-  - LetheanNetwork/lemma
-base_model_relation: quantized
+- LetheanNetwork/lemma
+base_model_relation: finetune
 tags:
-  - gemma4
-  - lemma
-  - gguf
-  - llama.cpp
-  - ollama
-  - multimodal
-  - vision
-  - audio
-  - on-device
-  - conversational
+- gemma4
+- lemma
+- gguf
+- llama.cpp
+- ollama
+- multimodal
+- vision
+- audio
+- on-device
+- conversational
 ---
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