[2.9.0] Rename plugin to compound-engineering

BREAKING: Plugin renamed from compounding-engineering to compound-engineering.
Users will need to reinstall with the new name:

  claude /plugin install compound-engineering

Changes:
- Renamed plugin directory and all references
- Updated documentation counts (24 agents, 19 commands)
- Added julik-frontend-races-reviewer to docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docs/pages/changelog.html

@@ -81,7 +81,7 @@
       <article class="docs-article">
         <h1><i class="fa-solid fa-clock-rotate-left color-accent"></i> Changelog</h1>
         <p class="lead">
-          All notable changes to the compounding-engineering plugin. This project follows
+          All notable changes to the compound-engineering plugin. This project follows
           <a href="https://semver.org/">Semantic Versioning</a> and
           <a href="https://keepachangelog.com/">Keep a Changelog</a> conventions.
         </p>
@@ -116,7 +116,7 @@
             <ul>
               <li>
                 <strong><code>/report-bug</code> command</strong> - New slash command for reporting bugs in the
-                compounding-engineering plugin. Provides a structured workflow that gathers bug information
+                compound-engineering plugin. Provides a structured workflow that gathers bug information
                 through guided questions, collects environment details automatically, and creates a GitHub
                 issue in the EveryInc/every-marketplace repository.
               </li>
@@ -428,7 +428,7 @@
           </div>
 
           <p class="version-description">
-            Initial release of the compounding-engineering plugin.
+            Initial release of the compound-engineering plugin.
           </p>
 
           <div class="changelog-category added">