fix(doc-page): restore deep-link scrolling and show AsciiDoc section anchor icons

Two related fixes for the long-form workflow pages (brownfield, spec-driven-development, brownfield-experiment-report, etc.):

1. Deep links like /brownfield#phase-0-5-socratic-code-theory-recovery
   landed on the page but did not scroll to the section. The pre-rendered
   HTML has the section IDs, so the browser jumps there initially — but
   then the SPA boots, doc-page.js replaces #doc-content with a fresh
   "Loading..." shell, and the scroll target is destroyed. After the
   async fragment fetch completes, we now re-scroll to the URL hash.

2. Asciidoctor already emits <a class="anchor" href="#id"> before each
   heading (sectanchors:true is set in render-docs.js), but the link was
   invisible. Add the AsciiDoc-standard § symbol that fades in on heading
   hover, so readers can grab a link to any section. scroll-margin-top
   keeps the heading from disappearing behind the sticky header when the
   user follows such a link.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: raifdmueller

website/src/components/doc-page.js

@@ -64,6 +64,18 @@ export async function loadDocContent(docPath) {
     // Attach click-to-load handlers for any YouTube placeholders in the doc.
     // Keeps us DSGVO-compliant: YouTube is only contacted after user consent.
     hydrateYouTubeFacades(contentEl)
+
+    // Restore deep-link scrolling: if the URL has a hash (e.g. #phase-0-5),
+    // the browser tried to scroll there before the SPA replaced #doc-content
+    // with this newly fetched HTML. Re-scroll to the target now that the
+    // section exists in the DOM.
+    if (window.location.hash) {
+      const id = decodeURIComponent(window.location.hash.slice(1))
+      const target = document.getElementById(id)
+      if (target) {
+        target.scrollIntoView({ behavior: 'auto', block: 'start' })
+      }
+    }
   } catch (error) {
     console.error('Failed to load documentation:', error)
     contentEl.innerHTML = `

website/src/styles/main.css

@@ -520,3 +520,56 @@ body {
   height: 100%;
   border: 0;
 }
+
+/* AsciiDoc section anchors: visible chain icon on hover, like the default
+   Asciidoctor stylesheet. Asciidoctor renders <a class="anchor" href="#id">
+   before each heading when sectanchors:true is set in render-docs.js. */
+.asciidoc-content h1,
+.asciidoc-content h2,
+.asciidoc-content h3,
+.asciidoc-content h4,
+.asciidoc-content h5,
+.asciidoc-content h6 {
+  position: relative;
+  scroll-margin-top: 5rem;
+}
+
+.asciidoc-content h1 > a.anchor,
+.asciidoc-content h2 > a.anchor,
+.asciidoc-content h3 > a.anchor,
+.asciidoc-content h4 > a.anchor,
+.asciidoc-content h5 > a.anchor,
+.asciidoc-content h6 > a.anchor {
+  position: absolute;
+  left: -1.25rem;
+  top: 0;
+  bottom: 0;
+  display: flex;
+  align-items: center;
+  width: 1.25rem;
+  opacity: 0;
+  text-decoration: none;
+  color: var(--color-text-secondary, #6b7280);
+  transition: opacity 0.15s ease-in-out;
+}
+
+.asciidoc-content h1:hover > a.anchor,
+.asciidoc-content h2:hover > a.anchor,
+.asciidoc-content h3:hover > a.anchor,
+.asciidoc-content h4:hover > a.anchor,
+.asciidoc-content h5:hover > a.anchor,
+.asciidoc-content h6:hover > a.anchor,
+.asciidoc-content a.anchor:focus {
+  opacity: 1;
+}
+
+.asciidoc-content a.anchor::before {
+  content: '\00a7'; /* § — same convention as the default Asciidoctor stylesheet */
+  font-size: 0.85em;
+  font-weight: normal;
+}
+
+.asciidoc-content a.anchor:hover {
+  color: var(--color-link, #2563eb);
+  text-decoration: none;
+}