fix(a11y): stop claude's mascot bouncing under reduced motion

[RealZST]

What

One line in mascot.css: name .mascot-claude.is-animated in the
prefers-reduced-motion exemption list (plus a comment explaining why the bare
selectors there are not redundant).

Why

The block exempted .mascot-claude.is-animated *. * matches descendants
only, and claude-jump is on the wrapper itself:

.mascot-claude.is-animated {
  animation: claude-jump 1.2s ... infinite;   /* ← the wrapper */
}
.mascot-claude.is-animated .arm-right { ... } /* ← covered by `*` */

So with "reduce motion" on, hovering Claude's card froze the arms, legs and
eyes while the whole figure kept bouncing — an infinite loop, which is exactly
the category the media query exists to stop. It reads as a stuck animation
rather than a calm one.

Why this is safe

• claude-jump's 0%/100% is translateY(0) scale(1) — the identity
  transform — so stopping it lands on the resting pose. No layout shift.
• The wrapper has no base rule: all fifteen .mascot-claude* rules target
  descendants or the two state classes, so the block's transition: none
  has nothing to clobber.
• Not a new behaviour — omp, dsh and grok already name their wrappers for the
  same reason. This closes the inconsistency.
• The card's own hover affordance (border, background, shadow, lift) lives on
  the <button>, outside this media block, so hovering still gives feedback.

Is anything else affected?

No. I parsed the stylesheet and pulled every rule whose selector is exactly
.mascot-<agent>.is-animated or .is-clicked and that sets animation —
i.e. every wrapper-level animation across all thirteen mascots:

agent	state	wrapper animation	exempt before
claude	hover	claude-jump	no
claude	click	claude-peek	yes
dsh	hover	dsh-breach	yes
dsh	click	(composite)	yes
grok	click	grok-toss	yes
omp	hover	omp-float	yes

Six in total, and this was the only gap. Every other mascot animates
descendants only, which the existing * selectors already cover. Re-running
the audit after the change reports no unexempted wrapper animations.

Checks

npm run lint clean (183 files) · npm test 34 files / 307 tests · npm run build clean.