feat(shared-vault-sync): add commit-driven auto-push script

push-shared-vault.sh pushes the shared vault only when the worktree is clean
and the local branch is ahead of origin (fetch first); never rebases,
force-pushes, or resolves conflicts. Ships with launchd setup docs. Bump 0.1.2.

Co-Authored-By: Claude <noreply@anthropic.com>

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

@@ -1,6 +1,6 @@
 {
   "name": "shared-vault-sync",
-  "version": "0.1.1+codex.20260901101401",
+  "version": "0.1.2+codex.20260901103344",
   "description": "Safely pulls the shared vault at interactive session start.",
   "author": {
     "name": "Local developer"