feat(seo): add llms.txt for AI crawlers

src/app/llms.txt/route.ts

@@ -0,0 +1,43 @@
+import { getAllPosts } from '@/lib/blog';
+
+export const dynamic = 'force-static';
+
+const ORIGIN = 'https://vreshch.com';
+
+export async function GET(): Promise<Response> {
+  const posts = await getAllPosts();
+
+  const writing = posts
+    .map((post) => {
+      const desc = post.description ? `: ${post.description}` : '';
+      return `- [${post.title}](${ORIGIN}/blog/${post.slug})${desc}`;
+    })
+    .join('\n');
+
+  const body = `# Volodymyr Vreshch
+
+> Senior Software Engineer at Microsoft who writes about AI agents, the Model Context Protocol, and AI memory, and builds open-source tooling.
+
+## Writing
+
+${writing}
+
+## Pages
+
+- [Interests](${ORIGIN}/interests): about, background, and track record.
+- [Projects](${ORIGIN}/projects): open-source and side projects.
+- [Contacts](${ORIGIN}/contacts): ways to get in touch.
+
+## Projects
+
+- [agentage](https://agentage.io): open-source AI memory shared across assistants over MCP.
+- [MCP directory](https://catalog.agentage.io/mcp): public directory of Model Context Protocol servers.
+- [GitHub](https://github.com/vreshch): open-source projects he works on.
+`;
+
+  return new Response(body, {
+    headers: {
+      'Content-Type': 'text/plain; charset=utf-8',
+    },
+  });
+}