feat(landing): replace root redirect with org landing page

Root index.html now shows a minimal "recursive knowledge" landing page
instead of auto-redirecting to the KCSI project.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DNVHvsfgTsiG6YztyqPYuj

Author: xuefei-wang

index.html

@@ -3,12 +3,29 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Knowledge-Centric Self-Improvement</title>
-  <link rel="canonical" href="https://recursive-knowledge.github.io/knowledge-centric-self-improvement/">
-  <meta http-equiv="refresh" content="0; url=./knowledge-centric-self-improvement/">
-  <script>location.replace("./knowledge-centric-self-improvement/" + location.hash);</script>
+  <title>Recursive Knowledge</title>
+  <style>
+    html, body {
+      height: 100%;
+      margin: 0;
+    }
+    body {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+      background: #ffffff;
+      color: #1a1a2e;
+    }
+    h1 {
+      font-weight: 600;
+      font-size: 2rem;
+      letter-spacing: 0.02em;
+      margin: 0;
+    }
+  </style>
 </head>
 <body>
-  <p>Redirecting to <a href="./knowledge-centric-self-improvement/">Knowledge-Centric Self-Improvement</a>&hellip;</p>
+  <h1>recursive knowledge</h1>
 </body>
 </html>