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8ed1a6e5 - tag paper reproductions with arxiv ids (#2657)

tag paper reproductions with arxiv ids (#2657) * tag paper reproductions with arxiv ids Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fold arxiv tag rule into the attribution paragraph Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * drop ceiling comment Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * only tag papers that have an arxiv id Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>