Critical renders as an outline badge on the destructive tokens
(border-destructive/60 text-destructive; AA vs --card: 4.76:1 light,
4.69:1 dark — no dark override needed). High becomes a neutral outline
(border-border text-muted-foreground). Medium/Low stay badge-less.
Deletes the unconsumed severityStyle/SEVERITY_STYLE map (filled
red/orange/yellow/blue accents; zero component call sites) — severity
keys a badge, never card color, and the tone-vs-severity invariant test
is preserved. Badge tests updated in lockstep: old literal assertions
replaced with token-shaped ones (outline = no bg- class, no palette red/
orange). Part of the Quiet Ledger series (commit 1 of 6).
Co-Authored-By: Paperclip <noreply@paperclip.ing>
