docs(sidebar): add Spec Driven section to sidebar

Added a new "Spec Driven" category with related pages to the sidebar navigation.

Author: phodal

sidebars.js

@@ -150,6 +150,15 @@ const sidebars = {
 				'agent/server-example',
 			],
 		},
+		{
+			type: 'category',
+			label: 'Spec Driven',
+			items: [
+				'spec/index',
+				'spec/github-spec-kit',
+				'spec/claude-skill',
+			],
+		},
 		{
 			type: 'category',
 			label: 'Local Agents',