BCCard/MoAI-Embedding-4B

docs: add Avg column to encoder comparison

docs: add Qwen3-Embedding base to encoder comparison

docs: add MAP@10 to external-baseline comparison

docs: add LFM2.5 to external-baseline comparison

docs: add external-baseline comparison (bge-m3 / e5-large / embeddinggemma)

v4 merged release (test NDCG@10 0.6906)

initial commit