detector: catch pseudo-element side stripes; add pulsing-dot rule

Two gaps surfaced by human eval review of real artifacts:

1. side-tab missed the pseudo-element variant. The accent stripe drawn as
   an absolutely-positioned ::before/::after (left/right: 0, top+bottom: 0
   or height: 100%, narrow width, colored background) uses no border
   property at all, so neither the element-level border checks (pseudo
   elements never enter the static cascade or DOM walk) nor the
   border-left/right regexes could see it. New scanCssTextForPseudoStripe
   scans stylesheet text for that shape, mirroring the border rule's
   gates: >= 3px thick (<= 12px), chromatic fill (var()-resolved, neutral
   dividers skipped), full height against a side edge, with the
   blockquote/prose exemptions preserved.

2. New pulsing-dot rule (slop): small circular "live" indicator dots
   (<= 16px, border-radius >= 40% or pill values) bound to an infinite
   animation whose keyframes vary opacity, scale, or box-shadow — or
   pulse/blink/ping names when the keyframes aren't in the scanned text —
   plus the Tailwind animate-ping/pulse + rounded-full + tiny-size utility
   combo. Rotation-only keyframes (spinners) never flag, including when
   they hide behind a pulse-like name.

Both scanners live in checkHtmlPatterns, so the static-html engine and
the browser bundle share the same detection path. Browser/extension
bundles regenerated; docs rule count bumped to 47.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

cli/engine/registry/antipatterns.mjs

@@ -104,6 +104,15 @@ const ANTIPATTERNS = [
     skillSection: 'Motion',
     skillGuideline: 'bounce or elastic easing',
   },
+  {
+    id: 'pulsing-dot',
+    category: 'slop',
+    name: 'Pulsing status dot',
+    description:
+      'Small pulsing status dots simulate liveness decoratively. Reserve pulse animation for indicators tied to genuinely live, changing data; a static indicator with clear labeling is honest and calmer.',
+    skillSection: 'Motion',
+    skillGuideline: 'decorative pulsing status dot',
+  },
   {
     id: 'dark-glow',
     category: 'slop',