Fix sitemap, remove orphaned assets, add wallpaper download

- sitemap.xml: add all 6 product pages + about.html, remove stale manifesto.html
- Remove dropped GM and Guntank SVGs from assets/plots/
- Add phone wallpaper download button on product pages (renders current
  suit + ink color to 1170x2532 PNG on Bristol background)

https://claude.ai/code/session_01VhWRYXbuqapZ9YkvksroaS

Author: claude

assets/plots/gm.svg

@@ -56,6 +56,7 @@
           <button class="pd-replay" id="pdReplay" hidden>▶&#xFE0E; Watch it plot</button>
         </div>
         <div class="pd-stage-meta tiny"><span id="pdInk">マシンドロー</span><span id="pdSize"></span></div>
+        <button class="pd-wallpaper tiny" id="pdWallpaper">↓ Download phone wallpaper</button>
       </div>
 
       <!-- RIGHT: details + acquire -->

assets/plots/guntank.svg

@@ -170,7 +170,66 @@
 
     return {
       restart: restart,
-      setInk: function (hex) { ink = hex; }
+      setInk: function (hex) { ink = hex; },
+      wallpaper: function (inkHex) {
+        var W = 1170, H = 2532;
+        var off = document.createElement("canvas");
+        off.width = W; off.height = H;
+        var oc = off.getContext("2d");
+
+        oc.fillStyle = "#f6f3ec";
+        oc.fillRect(0, 0, W, H);
+
+        var sc = Math.min(W / vb.w, H / vb.h) * 0.8;
+        var offX = (W - vb.w * sc) / 2;
+        var offY = (H - vb.h * sc) / 2;
+
+        oc.strokeStyle = inkHex;
+        oc.lineWidth = Math.max(1.5, 2);
+        oc.lineJoin = "round";
+        oc.lineCap = "round";
+
+        var step = Math.max(0.5, 2 / sc);
+        var liftSq = (step * 3) * (step * 3);
+        var prev = null;
+        oc.beginPath();
+        for (var L = 0; L < len; L += step) {
+          var p = path.getPointAtLength(L);
+          var mx = offX + (p.x - vb.x) * sc;
+          var my = offY + (p.y - vb.y) * sc;
+          if (!prev) { oc.moveTo(mx, my); }
+          else {
+            var dx = p.x - prev.x, dy = p.y - prev.y;
+            if (dx * dx + dy * dy > liftSq) oc.moveTo(mx, my);
+            else oc.lineTo(mx, my);
+          }
+          prev = p;
+        }
+        oc.stroke();
+
+        oc.font = "bold 28px 'Archivo', sans-serif";
+        oc.fillStyle = "rgba(21,22,15,0.25)";
+        oc.textAlign = "center";
+        oc.fillText("PLOTFLOW*", W / 2, H - 60);
+
+        return off.toDataURL("image/png");
+      }
     };
   }
+
+  // ---- wallpaper download ----
+  var dlBtn = $("pdWallpaper");
+  if (dlBtn) {
+    dlBtn.addEventListener("click", function () {
+      dlBtn.textContent = "Rendering…";
+      setTimeout(function () {
+        var dataUrl = plot.wallpaper(INKS[color].hex);
+        var a = document.createElement("a");
+        a.href = dataUrl;
+        a.download = key + "-" + color + "-wallpaper.png";
+        a.click();
+        dlBtn.textContent = "↓ Download phone wallpaper";
+      }, 50);
+    });
+  }
 })();

product.html

@@ -1,8 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url><loc>https://plotflow.io/</loc><priority>1.0</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=zaku</loc><priority>0.9</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=guncannon</loc><priority>0.9</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=bigzam</loc><priority>0.9</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=dom</loc><priority>0.9</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=zgok</loc><priority>0.9</priority></url>
+  <url><loc>https://plotflow.io/product.html?id=gp02</loc><priority>0.9</priority></url>
   <url><loc>https://plotflow.io/commissions.html</loc><priority>0.8</priority></url>
-  <url><loc>https://plotflow.io/manifesto.html</loc><priority>0.6</priority></url>
+  <url><loc>https://plotflow.io/about.html</loc><priority>0.6</priority></url>
   <url><loc>https://plotflow.io/contact.html</loc><priority>0.6</priority></url>
   <url><loc>https://plotflow.io/faq.html</loc><priority>0.6</priority></url>
   <url><loc>https://plotflow.io/shipping.html</loc><priority>0.5</priority></url>

scripts/product.js

@@ -232,6 +232,9 @@ footer .grain{opacity:.3}
   color:var(--ink);background:var(--bristol);border:1px solid var(--ink);padding:9px 16px}
 .pd-replay:hover{background:var(--ink);color:var(--bristol)}
 .pd-stage-meta{display:flex;justify-content:space-between;margin-top:10px;color:var(--dim)}
+.pd-wallpaper{display:block;width:100%;margin-top:8px;padding:10px;color:var(--dim);border:1px solid var(--line);
+  background:transparent;font-weight:700;font-size:8.5px;letter-spacing:.14em;text-transform:uppercase;text-align:center;transition:border-color .2s,color .2s}
+.pd-wallpaper:hover{border-color:var(--mute);color:var(--white)}
 
 .pd-head{border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:18px}
 .pd-code{color:var(--red);letter-spacing:.18em;margin-bottom:8px}