ocr: pin transformers<5 in dots-mocr (#76)

dots.mocr's remote code calls AutoProcessor.register with a string
key, which transformers v5 rejects (AttributeError: 'str' object has
no attribute '__module__'). transformers rode in unpinned via vllm and
drifted to v5. Verified on a real l4x1 Job (5-sample smoke + 50-sample
production run).

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: davanstrien

ocr/dots-mocr.py

@@ -8,6 +8,9 @@
 #     "tqdm",
 #     "toolz",
 #     "torch",
+#     # dots.mocr's remote code (AutoProcessor.register with a string key)
+#     # breaks on transformers v5; vllm pulls transformers unpinned.
+#     "transformers<5",
 # ]
 #
 # ///