Add SEO baseline: robots.txt, sitemap.xml, canonical, OG/Twitter tags, JSON-LD

Also fixes a broken LinkedIn URL (/in/idobkin/ 404s; correct profile
is /in/ilia-dobkin-8263343/) that was referenced in the contact data.

index.html

@@ -5,7 +5,32 @@
   <meta name="viewport" content="width=device-width,initial-scale=1" />
   <title>Ilia Dobkin — portfolio.spec.ts</title>
   <meta name="description" content="Ilia Dobkin — Senior SDET portfolio, styled as a Playwright test runner." />
+  <meta property="og:title" content="Ilia Dobkin — Senior SDET" />
+  <meta property="og:description" content="Senior SDET portfolio, styled as a Playwright test runner. Test strategy, automation, and release confidence." />
+  <meta property="og:type" content="website" />
+  <meta property="og:url" content="https://iliadobkin.com/" />
+  <meta property="og:site_name" content="Ilia Dobkin" />
+  <meta name="twitter:card" content="summary" />
+  <meta name="twitter:title" content="Ilia Dobkin — Senior SDET" />
+  <meta name="twitter:description" content="Senior SDET portfolio, styled as a Playwright test runner." />
+  <link rel="canonical" href="https://iliadobkin.com/" />
   <link rel="icon" type="image/svg+xml" href="assets/favicon.svg" />
+  <script type="application/ld+json">
+    {
+      "@context": "https://schema.org",
+      "@type": "Person",
+      "name": "Ilia Dobkin",
+      "url": "https://iliadobkin.com/",
+      "jobTitle": "Senior SDET",
+      "email": "idobkin@gmail.com",
+      "sameAs": [
+        "https://www.linkedin.com/in/ilia-dobkin-8263343/",
+        "https://levkin.ca/",
+        "https://caseware.levkin.ca/",
+        "https://auto.levkin.ca/"
+      ]
+    }
+  </script>
   <link rel="preconnect" href="https://fonts.googleapis.com" />
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap" rel="stylesheet" />

js/data.js

@@ -7,7 +7,7 @@ window.PORTFOLIO = {
     location: "Remote (ET)",
     workAuth: "Canadian citizen",
     email: "idobkin@gmail.com",
-    linkedin: "https://www.linkedin.com/in/idobkin/",
+    linkedin: "https://www.linkedin.com/in/ilia-dobkin-8263343/",
     gitea: "https://git.levkin.ca",
     site: "https://iliadobkin.com",
     blurb:

robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://iliadobkin.com/sitemap.xml

sitemap.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>https://iliadobkin.com/</loc>
+    <changefreq>monthly</changefreq>
+    <priority>1.0</priority>
+  </url>
+</urlset>