Translate the optional #site-title header link at startup (AI)

document.title was already set from the siteName string, but a
visible #site-title header link stayed hardcoded in whatever language
it was typed in — a translated site showed a translated tab title
next to an untranslated header. Set once in router.js's init() rather
than showListView(), so a page that loads straight into an article
route still gets it. Documented #site-title as optional embedding
markup and corrected README's claim that <title> isn't JS-templated.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -271,9 +271,12 @@ The resolved locale also drives date formatting (`Intl.DateTimeFormat`), search
 tag-label sorting (`localeCompare`), via `getLocale()` in the same module — so a translation
 file doesn't just relabel text, it affects how dates and sorting behave too.
 
-Site-specific branding that lives in the embedding page itself (the page `<title>`, the header
-search placeholder, the sidebar section headings) is plain static HTML, not JS-templated —
-translate it by editing that page directly (`demo/index.html` for this repo's own demo).
+The page `<title>` and an optional `#site-title` header link (see "Embedding in an existing
+page" below) are both set from the `siteName` string at startup, so they stay in sync with the
+resolved locale automatically — translate `siteName` in `strings/xx.json` rather than editing
+the page. Other site-specific branding in the embedding page itself (the header search
+placeholder, the sidebar section headings) is plain static HTML, not JS-templated — translate
+that by editing the page directly (`demo/index.html` for this repo's own demo).
 
 ## Embedding in an existing page
 
@@ -350,6 +353,11 @@ demo does.
   ```html
   <nav id="tag-filters" aria-label="Filter by tag"></nav>
   ```
+- **Site title link — `#site-title`.** Optional; its text is set to the `siteName` string once at
+  startup, so it stays in sync with the resolved locale without editing the page per language.
+  ```html
+  <a href="#" id="site-title">My Site</a>
+  ```
 
 `#tag-filters` is optional — omit it and nothing breaks, the article list and search still work
 standalone.

js/router.js

@@ -78,6 +78,13 @@ function init() {
         if (!document.getElementById('list-view') || !document.getElementById('article-view')) {
             throw new Error('Missing required #list-view and/or #article-view element — see the "Embedding in an existing page" section of the README.');
         }
+        // Optional embedding-page markup (see "Embedding in an existing
+        // page" in the README) — set once here rather than in
+        // showListView()/loadArticle() so a page that loads straight into
+        // an article route (a direct link) still gets it, not just one that
+        // starts on the list view.
+        const siteTitle = document.getElementById('site-title');
+        if (siteTitle) siteTitle.textContent = t('siteName');
     });
 
     // Show a top-level error if dependencies fail to load (or a mount point