fix(renames): add wordpress.com -> build-with-wordpress redirect

PR #3751 renamed the `wordpress.com` marketplace entry to
`build-with-wordpress` but did not add a matching `renames` entry, so the
old slug does not redirect: existing `wordpress.com` installs resolve to
plugin-not-found and the old listing URL 404s.

Add the `renames` mapping so existing installs auto-migrate to the new slug.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -10,7 +10,8 @@
     "adlc": "agentforce-adlc",
     "airwallex": "airwallex-agentos",
     "convex-backend": "convex",
-    "vals": "valtown"
+    "vals": "valtown",
+    "wordpress.com": "build-with-wordpress"
   },
   "plugins": [
     {