Add OG/Twitter meta tags, llms.txt link tags, and robots.txt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: milanofthe

src/app.html

@@ -4,7 +4,17 @@
 		<meta charset="utf-8" />
 		<link rel="icon" type="image/png" href="%sveltekit.assets%/favicon.png" />
 		<meta name="viewport" content="width=device-width, initial-scale=1" />
-		<meta name="description" content="PathSim Documentation - A Python framework for simulating dynamical systems" />
+		<title>PathSim Documentation</title>
+		<meta name="description" content="API reference, examples, and guides for PathSim — a Python framework for simulating dynamical systems using block diagrams. Includes PathSim-Chem, PathSim-RF, PathSim-Vehicle, and PathSim-Flight toolboxes." />
+		<meta property="og:type" content="website" />
+		<meta property="og:title" content="PathSim Documentation" />
+		<meta property="og:description" content="API reference, examples, and guides for PathSim — a Python framework for simulating dynamical systems using block diagrams." />
+		<meta property="og:url" content="https://docs.pathsim.org" />
+		<meta name="twitter:card" content="summary" />
+		<meta name="twitter:title" content="PathSim Documentation" />
+		<meta name="twitter:description" content="API reference, examples, and guides for PathSim — a Python framework for simulating dynamical systems." />
+		<link rel="llms" type="text/plain" href="/llms.txt" title="LLM-readable documentation" />
+		<link rel="llms-full" type="text/plain" href="/llms-full.txt" title="Full LLM-readable documentation" />
 		<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&display=swap" rel="stylesheet" />

static/robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://docs.pathsim.org/sitemap.xml