Boundary alignment for credible low-emission hydrogen deployment: a PRISMA-S-informed open-metadata evidence map and structured critical synthesis — supporting data and evidence map

Version 2 adds a separate 17-study Scopus policy sensitivity/update layer, a synchronized public search log, revised PRISMA flow materials, a public-safe evidence map and an English Scopus reconciliation. The core PRISMA denominator remains 154. The four thematic Scopus reruns recover provenance only and do not generate new screening or inclusion counts. Raw licensed Scopus exports and copyrighted article full texts are not redistributed.