fix(web): about.html JSON-LD/breadcrumb -> /about + webgpu-runner.html meta description

- about.html schema.org SoftwareApplication url + breadcrumb still pointed at the old
  /product URL (missed in the /about migration); now /about + label 'About'.
- public/device/webgpu-runner.html (new Wave-1 page) had a <title> but no meta
  description -> broke W538 #3 'every public HTML page has crawlable title + description'.
  Added a description; W538 6/6 green.

Post-restore suite: 8787 pass / 6 fail; after this fix the only fails are the 5 known
env-concurrency flakes (quantize-worker torch-import + ship-gate inner node --test +
doctor 21s) — all pass standalone. No real regressions.

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

Author: sneaky-hippo

public/about.html

@@ -165,7 +165,7 @@
   "name": "kolm",
   "applicationCategory": "DeveloperApplication",
   "operatingSystem": "Linux, macOS, Windows (WSL)",
-  "url": "https://kolm.ai/product",
+  "url": "https://kolm.ai/about",
   "description": "Kolm is the product stack for production AI: route any model through one gateway, distill approved work into signed specialists, and run .kolm artifacts on cloud, browser, phone, VPC, or air-gap.",
   "offers": {
     "@type": "Offer",
@@ -768,7 +768,7 @@ <h2 class="ks-finale__h2">Use the models. Keep the data advantage.</h2>
   "@type": "BreadcrumbList",
   "itemListElement": [
     {"@type": "ListItem", "position": 1, "name": "Home", "item": "https://kolm.ai/"},
-    {"@type": "ListItem", "position": 2, "name": "Product", "item": "https://kolm.ai/product"}
+    {"@type": "ListItem", "position": 2, "name": "About", "item": "https://kolm.ai/about"}
   ]
 }
 </script>

public/device/webgpu-runner.html

@@ -4,6 +4,7 @@
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <meta name="robots" content="noindex" />
+  <meta name="description" content="On-device WebGPU/WASM inference runner — load a model via transformers.js and generate tokens locally in the browser, with a normalized result envelope. Part of the Kolmogorov Stack." />
   <title>On-device WebGPU runner · Kolmogorov Stack</title>
   <style>
     :root { color-scheme: light dark; }