meta(release): Sync plugin manifests to 9.5.1

Propagate the 9.5.1 patch version into the Claude and Codex
plugin manifests plus the generated Claude marketplace metadata.
This keeps release:preflight from leaving tracked changes after the
release sync step.

Refs #445

plugins/antigravity-bundle-python-pro/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "antigravity-bundle-python-pro",
-  "version": "9.5.0",
+  "version": "9.5.1",
   "description": "Editorial \"Python Pro\" bundle for Claude Code from Antigravity Awesome Skills.",
   "author": {
     "name": "sickn33 and contributors",