A trust-tiered 'librarian' plus multi-agent writer drives 6,845 cross-section contradictions to zero across 555,926 evidence cards

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'Reconcile Once, Write Anytime' (arXiv:2608.12984, Aug 13, 2026, Xing Zhang et al.) splits knowledge maintenance from report composition: a deterministic librarian ingests timestamped sources into evidence cards, a metric ledger and claim graphs, while a multi-agent writer may only read evidence stamped at or before a declared cutoff. Over 555,926 evidence cards from 6,130 sources (SEC filings, labor statistics, Wikipedia) the shared metric ledger removes 6,845 cross-section contradictions to zero, with a 3.7x speedup over serial processing and trust tiering that stops media numbers from displacing government or filing data. This is a concrete architecture for anyone whose research agents keep contradicting themselves between sections.