docs: add rename notice below packages on homepage

Render a "Formerly B2C DX" info callout at the bottom of the
homepage via frontmatter-driven renameNotice in HomeLayout.

Author: clavery

.changeset/rebrand-rename-notice.md

@@ -0,0 +1,5 @@
+---
+'@salesforce/b2c-dx-docs': patch
+---
+
+Add rename notice to homepage explaining B2C DX is now the Agentic B2C Developer Toolkit

docs/.vitepress/theme/HomeLayout.vue

@@ -23,6 +23,15 @@ const {frontmatter, theme} = useData();
     <VPHomeFeatures />
 
     <HomePackages />
+
+    <div v-if="frontmatter.renameNotice" class="home-rename-notice">
+      <VPHomeContent>
+        <div class="custom-block info">
+          <p class="custom-block-title">{{ frontmatter.renameNotice.title }}</p>
+          <p>{{ frontmatter.renameNotice.text }}</p>
+        </div>
+      </VPHomeContent>
+    </div>
   </div>
 </template>
 

docs/index.md

@@ -3,6 +3,10 @@ description: Agentic B2C Developer Toolkit — CLI, Agent Skills, MCP Server, SD
 layout: b2c-home
 isHome: true
 
+renameNotice:
+  title: Formerly B2C DX
+  text: "The project previously known as B2C DX (B2C Developer Tooling) is now the Agentic B2C Developer Toolkit. The CLI package name (@salesforce/b2c-cli), commands, and configuration remain the same."
+
 hero:
   name: Agentic B2C Developer Toolkit
   text: ""
@@ -112,3 +116,4 @@ npx @salesforce/b2c-cli setup skills
 ```
 
 :::
+