Add "Under the hood" moat section to executive summary

Frame the defensible tech as product differentiation (no business
framing): a fine-tuned on-device model, measured safety (0→97% label
extraction, 100% unsafe-prompt refusals), and compounding local context.
Added to both the screen layout and the print one-pager.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/(marketing)/executive-summary/page.tsx

@@ -50,6 +50,24 @@ const differentiators = [
   },
 ];
 
+const MOAT =
+  "The privacy promise is easy to claim. The execution is not. Medscribe runs a fine-tuned medical model entirely on the phone, built and measured rather than bolted on.";
+
+const moat = [
+  {
+    title: "A model tuned for this job",
+    body: "A compact, multi-task model handles label scanning, structured extraction, and safe medication Q&A on the device. Fine-tuning lifted prescription-label field extraction from 0% to 97% in evaluation.",
+  },
+  {
+    title: "Safety you can measure",
+    body: "Each release is scored against a held-out set for grounding and safe refusals. Unsafe-prompt refusals reached 100% after tuning, so “defers to a clinician” is a tested behavior, not a hope.",
+  },
+  {
+    title: "Context that compounds",
+    body: "Real visit transcripts, a real medication list, and bundled drug facts fuse into one local record, value that grows with use and is hard to replicate without the same on-device capture.",
+  },
+];
+
 const scenarios = [
   {
     title: "The ER that doesn't know you",
@@ -172,6 +190,27 @@ export default function ExecutiveSummaryPage() {
           </div>
         </section>
 
+        {/* Under the hood */}
+        <section className="space-y-6">
+          <SectionLabel>Under the hood</SectionLabel>
+          <h2 className="font-serif text-3xl font-semibold tracking-tight sm:text-4xl">
+            Easy to claim. Hard to copy.
+          </h2>
+          <p className="max-w-4xl leading-relaxed text-muted-foreground">
+            {MOAT}
+          </p>
+          <div className="grid gap-4 md:grid-cols-3">
+            {moat.map((item) => (
+              <Card key={item.title} className="card-hover">
+                <CardHeader>
+                  <CardTitle className="text-lg">{item.title}</CardTitle>
+                  <CardDescription>{item.body}</CardDescription>
+                </CardHeader>
+              </Card>
+            ))}
+          </div>
+        </section>
+
         {/* Impact */}
         <section className="space-y-6">
           <SectionLabel>Potential impact</SectionLabel>
@@ -301,6 +340,26 @@ export default function ExecutiveSummaryPage() {
           </div>
         </section>
 
+        {/* Under The Hood */}
+        <section className="border-b border-teal-900/10 py-1">
+          <h2 className="font-serif text-[12pt] font-semibold tracking-tight text-foreground">
+            Under The Hood
+          </h2>
+          <div className="mt-0.5 grid grid-cols-3 gap-x-4">
+            {moat.map((item) => (
+              <p
+                key={item.title}
+                className="text-[11pt] leading-[1.25] text-slate-700"
+              >
+                <span className="font-semibold text-foreground">
+                  {item.title}.
+                </span>{" "}
+                {item.body}
+              </p>
+            ))}
+          </div>
+        </section>
+
         {/* Impact */}
         <section className="py-1">
           <h2 className="font-serif text-[12pt] font-semibold tracking-tight text-foreground">

src/app/(marketing)/page.tsx

@@ -332,7 +332,7 @@ export default function HomePage() {
               variant="outline"
               className="border-white/30 bg-white text-primary-button hover:bg-white/90"
             >
-              <a href="https://soconnor.dev">
+              <a href="mailto:sean@soconnor.dev?subject=Medscribe%20TestFlight%20invite%20request&body=Hi%20Sean%2C%0D%0A%0D%0AI%27d%20like%20a%20TestFlight%20invite%20to%20try%20Medscribe.%20I%27m%20managing%20medications%2C%20visits%2C%20or%20emergency%20context%20for%20someone%20I%20care%20for.%0D%0A%0D%0AThanks%21">
                 Request an invite
               </a>
             </Button>