Add splash intro, nuclear games + consulting, Cherenkov hero

- Splash: full-viewport animated SUCH logo cover with four corner nav
  buttons; reveals the site once "entered" (scroll-through or Explore) and
  does not resurrect on scroll-up. Original hero restored beneath it
  (title-anchored monitor pulse + Cherenkov-blue background).
- Logo: traveling Cherenkov glow ring + gentle letter breath (SVG/Framer,
  reduced-motion safe); beveled glass corner buttons.
- Services: new "Nuclear & Radiation Modeling" section + "Consulting"
  umbrella (payments, crypto, nuclear), MCNP Google Scholar link, and a
  not-a-licensed-PE clarification.
- About/founder bio: LLNL credibility + accessibility, art101.io link.
- Products: add Barns & Neutrons, Alpha Doc, Decay Theory (detail pages,
  OG cards, SVG icons); client-side sortable grid with coming-soon at the
  bottom. New Neroswap + Custom Websites icons (de-duplicated).
- SEO: game pages added to sitemap.
- Copy: dial back em-dashes to colons/commas/parens on home + services.

.gitignore

@@ -56,3 +56,7 @@ test-results/
 
 # AI / Assistant
 .claude/
+
+# Private strategy / internal notes (never publish)
+STRATEGY.md
+docs/internal/