detector: hero pulsing-dot promotion, nav-CTA contrast gap closure, shape-assembled-illustration (56 -> 57)

Item 1 (hero liveness theater):
- pulsing-dot now merges declarations per selector across rule blocks
  (cascade-approximate), descends into media queries, and strips
  prefers-reduced-motion: reduce overrides before the predicate runs.
  Catches the shipped split-block constructions (size in the base rule,
  animation added later or inside a no-preference media block).
- Dots whose element sits inside a header/nav landmark are promoted to
  error severity (string-level landmark ranges in both engines); the
  browser engine additionally promotes dots resting in the first ~900px.
- blinking-cursor findings in the first ~900px or inside header/nav are
  promoted from advisory to warning.
- Per-finding severity overrides now flow through static-html,
  browser-injected serialization, and detect-url.

Item 2 (nav-CTA contrast constructions):
- The a24-opus 01/002 header CTA already fires (specificity cascade +
  oklch + var() all resolved); systematic sweep found two remaining
  escapes and closes both:
  - own gradient background on a SAFE_TAGS element (checkColors styled-
    control exception now treats an own gradient as an own surface,
    contrast measured against the worst stop)
  - ::before/::after full-cover surface (static cascade marks pseudo
    surfaces; browser adapter reads the pseudo computed style) so text is
    measured against the surface the browser actually paints
- nav-cta-constructions fixture locks all eight computable construction
  families; background-image: url() remains unflaggable by design.

Item 3 (shape-assembled-illustration, slop/advisory):
- New rule for large inline SVGs composing a pictorial scene from >= 8
  primitive shapes at >= 200x200 intrinsic size with >= 3 distinct fills.
  Charts (axis labels), stroke-only technical drawings, icons/logos
  (small explicit size), and pattern-tiled backgrounds are exempt.
  1.8 percent fire rate over the 3069-sample eval corpus, all verified
  pictorial scenes; zero fires across val-a22/val-a24.

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

cli/engine/registry/antipatterns.mjs

@@ -122,6 +122,15 @@ const ANTIPATTERNS = [
       'A blinking text cursor animated into a hero or landing section simulates typing where no input exists. It borrows the dev-tool aesthetic as decoration. Real editable fields draw their own caret; anywhere else, let the composition hold attention without a fake prompt.',
     skillSection: 'Motion',
   },
+  {
+    id: 'shape-assembled-illustration',
+    category: 'slop',
+    severity: 'advisory',
+    name: 'Shape-assembled illustration',
+    description:
+      'A large inline SVG that builds a pictorial scene from a pile of primitive shapes reads as placeholder clip art, not illustration. Icons, logos, and data graphics are fine at their scale; a hero-sized visual deserves real artwork, a photograph, or a deliberately drawn graphic.',
+    skillSection: 'Imagery',
+  },
   {
     id: 'dark-glow',
     category: 'slop',