site: restore X-ray hero headline

Swap the h1 back to 'A structural X-ray for the codebases AI agents
are writing.' The concrete supporting paragraph (diff doesn't show
shape, dozens of edits an hour, six A-F dimensions, CI/treemap/MCP)
stays in place to do the explaining; the headline returns to the
brand framing.

og:description aligned to the same line so the social-share preview
matches the headline. <title> and <meta description> stay tuned for
search engines (concrete capability).

Author: Anton

site/index.html

@@ -9,7 +9,7 @@
 
   <meta property="og:type" content="website"/>
   <meta property="og:title" content="Raysense"/>
-  <meta property="og:description" content="Architecture quality, scored every save, served back to your AI."/>
+  <meta property="og:description" content="A structural X-ray for the codebases AI agents are writing."/>
   <meta property="og:url" content="https://rayforcedb.github.io/raysense/"/>
   <meta property="og:image" content="https://rayforcedb.github.io/raysense/assets/img/treemap-mockup.svg"/>
   <meta name="twitter:card" content="summary_large_image"/>
@@ -51,7 +51,7 @@
     <div class="hero-grid-2">
       <div class="hero-content">
         <div class="eyebrow">LIVE &middot; LOCAL &middot; AGENT-READY</div>
-        <h1>Architecture quality, scored every save, served back to your <span class="highlight">AI</span>.</h1>
+        <h1>A structural <span class="highlight">X-ray</span> for the codebases AI agents are writing.</h1>
         <p class="lead">
           A diff doesn't tell you whether your codebase is getting better-shaped or worse-shaped. With AI agents committing dozens of edits an hour, that gap is too big to bridge by reading review threads. Raysense scores the shape directly: six structural dimensions, graded A through F, aggregated into a single 0-to-100 number. The score is published to your CI as a pass/fail gate, to a live treemap in your browser, and to the agent itself over MCP, before its next edit.
         </p>