feat(ux): add hover-reveal ¶ anchors, strip parens from nav

- Add pilcrow (¶) anchor link after heading text for deep-linking
- CSS: hidden by default, visible on heading hover, user-overridable
- Add strip_parens Tera filter for cleaner nav anchor labels
- Update test expectations for new heading format

docs/static/style.css

@@ -193,6 +193,31 @@ h3 {
   margin: 1.5rem 0 0.75rem;
 }
 
+/* Heading anchor links (¶) - hover reveal for deep-linking */
+.heading-anchor {
+  visibility: hidden;
+  margin-left: 0.5em;
+  font-size: 0.75em;
+  color: var(--fg-muted);
+  text-decoration: none;
+  opacity: 0.5;
+}
+
+.heading-anchor:hover {
+  color: var(--accent);
+  opacity: 1;
+}
+
+/* Show anchor on heading hover */
+h1:hover .heading-anchor,
+h2:hover .heading-anchor,
+h3:hover .heading-anchor,
+h4:hover .heading-anchor,
+h5:hover .heading-anchor,
+h6:hover .heading-anchor {
+  visibility: visible;
+}
+
 p {
   margin-bottom: 1rem;
 }