dsh-remote 0.3.0: one-line macOS slave install

- deploy/install-mac.sh: per-user Node 22 (checksum-verified), DSH + pnpm in
  ~/.local, dsh-remote from the repo archive, pairing, LaunchAgent dsh web
- deploy/pair.mjs: pair without a running DSH (detects login-proxy redirects)
- install-local.mjs: --accept secrets list, --restart-on-sync
- sync.restartOnSync: slave restarts itself after synced plugins change
  (waits for idle sessions, at most once per 10 min)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@local/dsh-remote",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "description": "Claude-Desktop-style remote control for DSH: master/slave link, every device's sessions on every device (/r/<device>/), plugin + config sync with opt-in secrets.",
   "private": true,
   "type": "module",