Add CompactLM-5M weights (39 tensors, F32, 6,162,688 params, tied embeddings)

Add fresh eval results (val ppl + 15 samples + degeneracy check)

Add CompactLM-5M checkpoint (6,162,688 params, 39 tensors)

Add CompactLM-5M: from-scratch LLaMA-style 6.2M-param English LM on fineweb-edu

Add architecture config

initial commit