nook: fix the landing title, isolate /blog, grow the sitemap

The landing page spent its strongest on-page signal on the word "Home";
the title now carries the positioning line and the OG title carries the
full brand phrase. /blog on a product subdomain served the personal blog
in dev (vinxi ignores the vercel.json rewrites that protect production),
splitting the brand and crawl equity — subdomain hits now render the
shared 404. /agents, /changelog and /faq join the sitemap registry so
they are indexed as they land.

Tests: bun test (539 pass); vinxi build clean, no new tsc errors.

Issues: FRE-8, FRE-15, FRE-9

src/lib/sitemap-routes.ts

@@ -83,6 +83,9 @@ export const SITEMAP_ROUTES: Record<SiteId, SitemapEntry[]> = {
   nook: [
     { path: "/", changefreq: "weekly", priority: 1.0 },
     { path: "/checkout", changefreq: "monthly", priority: 0.5 },
-    { path: "/privacy", changefreq: "yearly", priority: 0.4 }
+    { path: "/privacy", changefreq: "yearly", priority: 0.4 },
+    { path: "/agents", changefreq: "weekly", priority: 0.9 },
+    { path: "/changelog", changefreq: "daily", priority: 0.7 },
+    { path: "/faq", changefreq: "monthly", priority: 0.8 }
   ]
 };

src/routes/blog/[title]/index.tsx

@@ -21,6 +21,8 @@ import { api } from "~/lib/api";
 import CustomScrollbar from "~/components/CustomScrollbar";
 import "../post.css";
 import { Post } from "~/db/types";
+import { useSite } from "~/context/SiteContext";
+import NotFound from "../../[...404]";
 
 const getPostByTitle = query(
   async (
@@ -262,6 +264,7 @@ const getPostByTitle = query(
 );
 
 export default function PostPage() {
+  const site = useSite();
   const params = useParams();
   const [searchParams] = useSearchParams();
 
@@ -297,6 +300,12 @@ export default function PostPage() {
     return str.includes('data-type="mermaid"');
   };
 
+  // Host-dispatch guard: blog posts live on the apex domain only (see the
+  // guard in blog/index.tsx for the dev-server rationale).
+  if (site().id !== "main") {
+    return <NotFound />;
+  }
+
   return (
     <Show
       when={data()}

src/routes/blog/index.tsx

@@ -9,6 +9,8 @@ import PostSorting from "~/components/blog/PostSorting";
 import PublishStatusToggle from "~/components/blog/PublishStatusToggle";
 import { TerminalSplash } from "~/components/TerminalSplash";
 import { CACHE_CONFIG } from "~/config";
+import { useSite } from "~/context/SiteContext";
+import NotFound from "../[...404]";
 
 const getPosts = query(async () => {
   "use server";
@@ -77,6 +79,7 @@ const getPosts = query(async () => {
 }, "posts");
 
 export default function BlogIndex() {
+  const site = useSite();
   const [searchParams] = useSearchParams();
 
   const sort = () => searchParams.sort || "newest";
@@ -89,6 +92,15 @@ export default function BlogIndex() {
 
   const data = createAsync(() => getPosts(), { deferStream: true });
 
+  // Host-dispatch guard: /blog is the personal blog on the apex domain only.
+  // Production rewrites already send `<sub>.freno.me/blog` → `/<sub>/blog`,
+  // which has no route — but in dev the vinxi server ignores vercel.json and
+  // would render the personal blog on a product subdomain, splitting the
+  // brand and crawl equity. Render the shared 404 instead.
+  if (site().id !== "main") {
+    return <NotFound />;
+  }
+
   return (
     <>
       <EdgeCacheHeaders maxAge={60} staleSeconds={3600} />

src/routes/nook/index.tsx

@@ -55,10 +55,10 @@ export default function NookLanding() {
     <>
       <EdgeCacheHeaders maxAge={300} />
       <PageHead
-        title="Home"
+        title="Agent control for your Mac"
+        ogTitle="The Nook — agent control for your Mac"
         description="The Nook — a native macOS utility for coding-agent orchestration, fan and thermal control."
         ogImage={`https://${site().domain}/nook/og.png`}
-        ogTitle="The Nook — native macOS agent orchestration"
         ogDescription="A one-time-purchase macOS app for coding-agent orchestration, fan control, and thermal insight."
       />