Both are data constants exported from design-tokens.ts — TIER_CONFIG
maps tier levels 1-4 to label/color/border CSS classes, and
COMM_TYPE_LABELS maps a2a_send/a2a_receive/task_update to display
labels. No logic to test; structural shape coverage.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>