CodeRabbit: the Colab sanity check resolved the tokenizer first and printed versions only on success, so the one broken path it exists to catch reported neither the installed versions nor CUDA status — the single most useful line for diagnosing a Colab environment. Versions now print first. CHANGELOG: contributor credit on all three entries, refs last. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>