fix(blog): add published class to Parts 3 and 4 on series page

timeline-item and timeline-status elements for Parts 3 & 4 were missing
the published CSS class, causing them to appear as unpublished/greyed out.

Author: ipv1337

blog/virtual-eng-org/index.html

@@ -140,14 +140,14 @@ <h2><a href="/blog/posts/virtual-eng-org-part-2.html">Giving Each Agent a Desk 
                 </div>
 
                 <!-- Part 3 -->
-                <div class="timeline-item" id="part-3">
+                <div class="timeline-item published" id="part-3">
                     <div class="timeline-marker">
                         <span class="timeline-number">3</span>
                     </div>
                     <div class="timeline-card">
                         <div class="timeline-card-header">
                             <span class="phase-label">Phase 3 — The Process</span>
-                            <span class="timeline-status"><i class="fas fa-check-circle"></i> Published</span>
+                            <span class="timeline-status published"><i class="fas fa-check-circle"></i> Published</span>
                         </div>
                         <a href="/blog/posts/virtual-eng-org-part-3.html">
                             <h2>The Orchestration Skill — Automating the Workflow</h2>
@@ -172,14 +172,14 @@ <h2>The Orchestration Skill — Automating the Workflow</h2>
                 </div>
 
                 <!-- Part 4 -->
-                <div class="timeline-item" id="part-4">
+                <div class="timeline-item published" id="part-4">
                     <div class="timeline-marker">
                         <span class="timeline-number">4</span>
                     </div>
                     <div class="timeline-card">
                         <div class="timeline-card-header">
                             <span class="phase-label">Phase 4 — The Self-Organizing Org</span>
-                            <span class="timeline-status"><i class="fas fa-check-circle"></i> Published</span>
+                            <span class="timeline-status published"><i class="fas fa-check-circle"></i> Published</span>
                         </div>
                         <a href="/blog/posts/virtual-eng-org-part-4.html">
                             <h2>Making It Stick — Teaching Your AI Workflow to Self-Organize</h2>