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Records with disjoint measures on one tuple no longer count as colliding, so the Refuse default does not refuse a sparse-measure CSV. Only the records that share a cell are listed and numbered. The Sum confirmation lists every summed cell rather than three and a count. Adds the date-derived name test. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze