New `type: "testimonial"` with structured attribution
(quote/name/role/org/url/image/date) plus a `layout: "testimonials"`
section behavior that renders the items as a tasteful crossfade
carousel — one quote at a time, 7s auto-advance, prev/next nav, dot
indicators, swipe support, ←/→ keys, pause on hover/focus, ARIA
live region.
Reduced-motion users automatically get .carousel--stacked: every
testimonial visible at once, controls hidden, no auto-advance. A
single-item section also skips the carousel chrome.
Per-template treatment: editorial uses Fraunces italic for the curly
quote mark and the body, swiss strips uppercase from titles per prior
fix, cosmos glows the mark with the cyan/violet accent stack.
Section auto-detects the layout when the first item is a testimonial,
matching how the clients layout already works.
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