Add LDT-10M model card

Add honest model card (architecture, training, undertraining status, real samples)

Tokenizer config (#5)

Architecture config (#4)

Byte-level BPE tokenizer (vocab 12288) (#3)

Self-contained LDT model definition (#2)

LDT-10M weights (47 tensors, 10,284,480 params, tied embeddings) (#1)

initial commit