Em dash removal, nav/form/terms updates

- Replace all em dashes with hyphens site-wide (22 files)
- Add Safety to nav
- Remove Express Interest button from enterprise header (form is the path now)
- Enterprise form: secondary headcount selection shows honest odds message; yes disables submit button
- Terms §5: add network layer indemnification (patent pending 64/036,821); no proprietary names
- Terms §4: Neuron Inference is live now, not Q3 2026

src/nav.el

@@ -1,4 +1,4 @@
-// components/nav.el — Top navigation bar.
+// components/nav.el - Top navigation bar.
 //
 // Returns an HTML string. Server-rendered, no JavaScript required for
 // the nav structure itself. Scroll-based opacity is CSS-only via
@@ -13,6 +13,7 @@ fn nav() -> String {
     <div class=\"nav-links\">
       <a href=\"#how-it-works\" class=\"nav-link\">How it works</a>
       <a href=\"#mission\"       class=\"nav-link\">Mission</a>
+      <a href=\"#safety\"        class=\"nav-link\">Safety</a>
       <a href=\"#pricing\"       class=\"nav-link\">Pricing</a>
       <a href=\"#enterprise\"    class=\"nav-link\">Enterprise</a>
       <a href=\"/about\"         class=\"nav-link\">About</a>