Remove above/below-the-line article from SW — framework content belongs on OC

The drama-triangle / above-below-the-line material is human-change content =
Open Communications' domain, not ShopWisdom's. Delete the SW article, drop it
from the sitemap, and rewrite the homepage handoff to bridge straight to OC
(which already teaches the line + drama triangle). OC stays a tight one-pager.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

index.html

@@ -135,7 +135,7 @@
       </div>
 
       <div class="handoff">
-        <p>The hardest part of capturing what someone knows is getting them to share it — and getting a shop to actually change how it works. That's a people problem, not a paperwork one. <a href="above-or-below-the-line.html">Read: are you above or below the line? →</a> — or see the human side at <a href="https://opencommunications.consulting">Open Communications →</a></p>
+        <p>The hardest part of capturing what someone knows is getting them to share it — and getting a shop to actually change how it works. That's a people problem, not a paperwork one — and it's exactly what our sister practice, <a href="https://opencommunications.consulting">Open Communications →</a>, is built for.</p>
       </div>
 
       <div class="service">