feat(mockups): slot 13 curtain call; allow three.js in 13

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/index.html

@@ -25,6 +25,7 @@
       <li class="card"><a href="/mockups/10-chart-scroll/"><span class="card__num">10</span><h2>Unrolling chart</h2><p>An editorial horizontal scroll whose ground is a long chart unrolling as you pan; motif threads trail beneath the route.</p><p class="card__try">Try this: Pan sideways and watch the ship and coastline move with you.</p></a></li>
       <li class="card"><a href="/mockups/11-chart-atlas/"><span class="card__num">11</span><h2>Atlas with insets</h2><p>An overview chart of the whole sea; each saga island opens an inset chart with its songs as ports.</p><p class="card__try">Try this: Open an island's inset, then a song, then zoom back out.</p></a></li>
       <li class="card"><a href="/mockups/12-vellum-atlas/"><span class="card__num">12</span><h2>Vellum atlas</h2><p>The atlas overview and island plates of 11, drawn in the vellum portolan style of 10.</p><p class="card__try">Try this: Open Cyclops' Island, pick a theme, and switch the plate's motif style (A/B/C).</p></a></li>
+      <li class="card"><a href="/mockups/13-curtain-call/"><span class="card__num">13</span><h2>Curtain call</h2><p>The frieze curtain that carries you from the 2D story into the 3D sea and down into a landing.</p><p class="card__try">Try this: Press Play, or step through: frieze, sea, Cyclops' Island, frieze, cave. Switch the look (1/2/3).</p></a></li>
     </ul>
   </main>
   <footer data-fan-credits></footer>

src/mockups/13-curtain-call/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>Curtain call — EPIC Timeline mockup</title>
+  <link rel="stylesheet" href="../../shared/credits.css" />
+  <link rel="stylesheet" href="./style.css" />
+</head>
+<body>
+  <main id="app"></main>
+  <footer data-fan-credits></footer>
+  <script type="module" src="./main.ts"></script>
+</body>
+</html>

src/mockups/13-curtain-call/main.ts

@@ -0,0 +1,3 @@
+import { mountCredits } from "../../shared/credits";
+
+mountCredits();

src/mockups/13-curtain-call/style.css

@@ -0,0 +1 @@
+body { margin: 0; --stub-13: 1; }

src/mockups/registry.ts

@@ -37,4 +37,7 @@ export const mockups: MockupInfo[] = [
   { slug: "12-vellum-atlas", number: 12, name: "Vellum atlas",
     pitch: "The atlas overview and island plates of 11, drawn in the vellum portolan style of 10.",
     tryThis: "Open Cyclops' Island, pick a theme, and switch the plate's motif style (A/B/C)." },
+  { slug: "13-curtain-call", number: 13, name: "Curtain call",
+    pitch: "The frieze curtain that carries you from the 2D story into the 3D sea and down into a landing.",
+    tryThis: "Press Play, or step through: frieze, sea, Cyclops' Island, frieze, cave. Switch the look (1/2/3)." },
 ];

src/server.ts

@@ -12,6 +12,7 @@ import m8 from "./mockups/09-chart-transit/index.html";
 import m9 from "./mockups/10-chart-scroll/index.html";
 import m10 from "./mockups/11-chart-atlas/index.html";
 import m11 from "./mockups/12-vellum-atlas/index.html";
+import m12 from "./mockups/13-curtain-call/index.html";
 
 export function startServer(port: number): Server<undefined> {
   return Bun.serve({
@@ -42,6 +43,8 @@ export function startServer(port: number): Server<undefined> {
       "/mockups/11-chart-atlas": Response.redirect("/mockups/11-chart-atlas/", 302),
       "/mockups/12-vellum-atlas/": m11,
       "/mockups/12-vellum-atlas": Response.redirect("/mockups/12-vellum-atlas/", 302),
+      "/mockups/13-curtain-call/": m12,
+      "/mockups/13-curtain-call": Response.redirect("/mockups/13-curtain-call/", 302),
     },
     development: process.env.NODE_ENV !== "production",
     fetch() {