refactor(shell): strip global chrome and retire /posts routes

app/page.tsx

@@ -1,30 +1,18 @@
-import { getPosts } from '@/lib/posts'
-import { PostList } from '@/components/posts/PostList'
-
-export default async function HomePage() {
-  const posts = await getPosts()
+import Link from 'next/link'
 
+export default function HomePage() {
   return (
-    <main className="mx-auto max-w-5xl px-6 py-10 sm:py-14">
-      <section aria-labelledby="recent-heading" className="space-y-7">
-        <div className="border-b border-border pb-5">
-          <h1 id="recent-heading" className="heading-xl m-0 text-ink">
-            Recent
-          </h1>
-        </div>
-
-        {posts.length > 0 ? (
-          <PostList posts={posts} />
-        ) : (
-          <div className="empty-state">
-            <p className="font-mono text-xs uppercase tracking-[0.22em] text-ink-soft">No posts yet</p>
-            <h3 className="heading-sm m-0 text-ink">The notebook is ready.</h3>
-            <p className="m-0 max-w-xl text-sm leading-6 text-ink-soft">
-              Add your first MDX post and it will show up here with the same polished card treatment.
-            </p>
-          </div>
-        )}
-      </section>
-    </main>
+    <div className="flex min-h-screen flex-col items-center justify-center gap-6 bg-blacksite-bg px-6 text-center text-blacksite-text">
+      {/* Temporary placeholder until the portfolio landing is implemented in P5. */}
+      <h1 className="font-display text-4xl font-semibold tracking-tight sm:text-6xl">
+        Krishna Ayyalasomayajula
+      </h1>
+      <Link
+        href="/blog/"
+        className="font-mono text-xs uppercase tracking-[0.22em] text-signal-cyan underline-offset-4 transition hover:text-signal-orange hover:underline"
+      >
+        Field Notes
+      </Link>
+    </div>
   )
 }