feat: sync shared vault at session start

plugins/shared-vault-sync/.codex-plugin/plugin.json

@@ -0,0 +1,20 @@
+{
+  "name": "shared-vault-sync",
+  "version": "0.1.0",
+  "description": "Safely pulls the shared vault at interactive session start.",
+  "author": {
+    "name": "Local developer"
+  },
+  "hooks": "./hooks/claude-codex-hooks.json",
+  "interface": {
+    "displayName": "Shared Vault Sync",
+    "shortDescription": "Safely pull the shared vault at session start.",
+    "longDescription": "Fast-forwards a clean shared vault at session start without blocking the agent when the network is unavailable.",
+    "developerName": "Local developer",
+    "category": "Productivity",
+    "capabilities": [
+      "Lifecycle hooks"
+    ],
+    "defaultPrompt": "Synchronize the shared vault."
+  }
+}