add mason lsp recover file

scripts/restore-mason.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+config_dir=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
+packages=()
+
+while IFS= read -r package || [[ -n $package ]]; do
+  [[ -z $package || $package == \#* ]] && continue
+  if [[ ! $package =~ ^[a-zA-Z0-9_-]+$ ]]; then
+    printf 'Invalid Mason package name: %s\n' "$package" >&2
+    exit 1
+  fi
+  packages+=("$package")
+done < "$config_dir/mason-packages.txt"
+
+if ((${#packages[@]} == 0)); then
+  printf 'No Mason packages listed.\n' >&2
+  exit 1
+fi
+
+nvim --headless \
+  -c 'lua require("lazy").load({ plugins = { "mason.nvim" } })' \
+  -c "MasonInstall ${packages[*]}" \
+  -c qall