Tidy the repository: remove docs/research and bench, fix references

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+**Repository tidy-up.** Removed the Phase-0 research notes (`docs/research/`), the P9 benchmark scripts (`bench/`,
+`scripts/cloud/tasks/p9*.sh`) and a vendor probe-name list that should never have been committed (also purged from
+the git history).
+
 **Branding.** A visual identity (`branding/`, guide in `branding/README.md`): a dotted simurg mark in detailed, simple
 and micro drawings, wordmark and lockups, icons, README banner, social preview and featured-image templates, with
 contrast and colour-vision checks. HTML reports (QC report, compare dashboard, methylation QC) get a favicon and a