Review-5548: record static-shell and CLS review
Review-5454: round 2 at exact head e24ef4c — approve (drafted) All three round-1 blockers verified satisfied. One new note: the heading pin is scoped to the built-in heading, so a custom renderGroupHeader still loses its chevron when scrolled (byte-identical to the pre-fix frame). Three critic passes; the unguarded arm and the at-rest state were driven rather than cited.
Review 5454: preserve custom header width and table scaling