The 19 COSMIC signatures whose aetiology is "Artefact" (SBS27, SBS43, SBS45-SBS60, SBS95), verified verbatim against the COSMIC SBS index page on 2026-10-04 and pinned by test literal: the roster the artifact-share surfaces count against.
Value
An `MsQcArtifactRoster` data.frame of 19 rows in the pinned enumeration order, one column `name`.
References
Design memo `vignettes/articles/devlog-2026-10-04-M4-02b-qc-memo.qmd` section 1 (the live-verified 19-entry enumeration; the page prose said "20 total" – the enumeration is the pin); roster constant `R/ms-qc-report.R` (.ms_qc_artifact_sbs); literal pin `tests/testthat/test-ms-qc-report.R` (the roster-pinned unit). COSMIC: cancer.sanger.ac.uk/cosmic/signatures/SBS.