Update tokenizer guide

Update dense guide

Add checkpoint 20260611 112534

Update tokenizer folder

Update clean dataset guide

Update clean dataset card layout

Move dataset checkpoint files to dataset folder

Update dataset guide and checkpoint reports

Document dataset-only checkpoint layout

Keep checkpoint folders dataset-only

Move checkpoint reports outside checkpoint folders

Add checkpoint 20260611 bundle01

Add MoE architecture docs

Add dense architecture docs

Add tokenizer docs

Add dataset guide

Add dataset card

initial commit