Water-quality pathway closure: minimal reproducibility archive

Minimal reproducibility archive for a water-quality pathway-closure analysis. The archive contains journal-neutral release metadata, main evidence figures, selected derived figure-ready tables, compact sensitivity summaries, checksums, and dependency-free validation scripts. It does not contain raw or restricted monitoring records, station-level identifying fields beyond sanitized labels, manuscript submission files, internal audit ledgers, private machine paths, credentials, author contact details, affiliations, or funding metadata. The materials support a bounded monitoring-design diagnostic and do not identify causal effects, operational safety, regulatory thresholds, or general prevalence beyond the included derived summaries.