[tokbench](https://github.com/huggingface/tokbench)'s `make models` downloads `models/<name>/tokenizer.json` for its five benchmark models from this dataset. None of those paths exist yet, so a fresh clone fails at `make models`. This PR adds them.
Each file is the unmodified `tokenizer.json` from the official model repo (full vocabularies — all five pass tokbench's truncated-vocab check, and the full benchmark matrix was run locally against these exact files before opening this PR):
| path | source | revision | sha256 |
|---|---|---|---|
| `models/gpt2/tokenizer.json` | [openai-community/gpt2](https://huggingface.co/openai-community/gpt2) | `607a30d783df` | `8414cab924d8b9b3…` |
| `models/llama-3/tokenizer.json` | [meta-llama/Meta-Llama-3-8B](https://huggingface.co/meta-llama/Meta-Llama-3-8B) | `8cde5ca83804` | `e134af98b985517b…` |
| `models/deepseek-v4/tokenizer.json` | [deepseek-ai/DeepSeek-V4-Pro](https://huggingface.co/deepseek-ai/DeepSeek-V4-Pro) | `b5968e9190ef` | `8f9f37ca37…
