feat(v2): add Awesome Lists hero card on index + Portal Guide nav entry

- New "Awesome Lists" hero-badge card on the V2 index, right after "Get
  Started", linking to /other-awesome-lists/.
- Custom gold-star + list-motif cover (docs/images/awesome-lists-cover.svg),
  matching the Awesome Lists page hero theme.
- New .hero-badge-card--gold modifier.
- Also list "Awesome Lists" under the Portal Guide top-bar menu (after Topic
  Map) for discoverability, in addition to the flagship "⭐ Awesome Lists" tab.
- Card added to the index template (survives regeneration) and to the current
  rendered v2-docs/index.md for immediate deploy.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/v2_optimizer.py

@@ -1362,6 +1362,13 @@ class V2VisionEngine:
             "      <div class=\"hero-badge-subtitle\">Introduction Guide</div>\n"
             "    </div>\n"
             "  </a>\n"
+            "  <a href=\"./other-awesome-lists/\" style=\"text-decoration: none; color: inherit; display: block;\">\n"
+            "    <div class=\"hero-badge-card hero-badge-card--gold\">\n"
+            "      <img src=\"/images/awesome-lists-cover.svg\" alt=\"Awesome Lists\"/>\n"
+            "      <div class=\"hero-badge-title\">Awesome Lists</div>\n"
+            "      <div class=\"hero-badge-subtitle\">Curated awesome-* directory</div>\n"
+            "    </div>\n"
+            "  </a>\n"
             "</div>\n\n"
             "!!! abstract \"The High-Density Vision\"\n"
             "    The V2 Edition is a curated, high-density version of the Nubenetes archive. Using **Agentic AI Orchestration**, "