docs: change step 3 heading from 'Ship' to 'Build'

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bradygaster

docs/src/pages/index.astro

@@ -264,7 +264,7 @@ const base = import.meta.env.BASE_URL;
         </div>
         <div class="flex-1 relative text-center flex flex-col items-center">
           <div class="inline-flex items-center justify-center w-12 h-12 rounded-2xl bg-squad-600 text-white font-bold text-lg mb-5 shadow-lg shadow-squad-600/25">3</div>
-          <h3 class="font-semibold text-surface-900 dark:text-white mb-2">Ship</h3>
+          <h3 class="font-semibold text-surface-900 dark:text-white mb-2">Build</h3>
           <p class="text-sm text-surface-600 dark:text-surface-400 mb-4 flex-1">Talk to your team — they build, test, and land PRs.</p>
           <code class="text-sm font-mono bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-green-400 px-3 py-1.5 rounded-lg border border-surface-200 dark:border-transparent">copilot --agent squad</code>
         </div>