em dashes out of skeleton copy (titles use ' - ', prose reworded); split hardening after review: poll errors name the failing repo, failed release is not retried until a new commit, link-content checks all three dirs, editor write-access note, two-repo unit descriptions and comments

src/pages/404.astro

@@ -1,7 +1,7 @@
 ---
 import Base from '../layouts/Base.astro';
 ---
-<Base title="CTAO Science Portal — Page not found" description="This page does not exist">
+<Base title="CTAO Science Portal - Page not found" description="This page does not exist">
   {/* Document archetype (DESIGN.md): the document IS the page — h1, one line,
       recovery links, and a real GET search form as the way forward. */}
   <div class="container article-layout">
@@ -10,8 +10,8 @@ import Base from '../layouts/Base.astro';
       <div class="prose">
         {/* Keep "the <a>" on one line: the compiler drops the whitespace at a
             line break before a tag, which glued "the" to the link text. */}
-        <p>The address may be mistyped or the page may have moved —
-          go to the <a href="/">home page</a> or browse <a href="/news">all news</a>.</p>
+        <p>The address may be mistyped or the page may have moved.
+          Go to the <a href="/">home page</a> or browse <a href="/news">all news</a>.</p>
       </div>
       <form class="search-form" role="search" action="/search" method="get">
         <label class="sr-only" for="nf-q">Search news</label>