docs: Update README and documentation for lxs multi-tool across Linux and Windows platforms.

linux/tools/harden.sh

@@ -6,10 +6,26 @@
 # Date: 2025
 
 # Load LXS common library (colors, separator, run_spinner, loggers, helpers)
+# Prefers the sibling ../lib/common.sh (repo checkout or installed layout) and
+# only hits the network when this script is run standalone via curl.
 LXS_RAW_BASE="${LXS_RAW_BASE:-https://git.hyko.cx/hykocx/lxs/raw/branch/main}"
-_lib=$(curl -fsSL "${LXS_RAW_BASE}/lib/common.sh") || { echo "Failed to fetch lib/common.sh" >&2; exit 1; }
-eval "$_lib"
-unset _lib
+LXS_RAW_PLATFORM_BASE="${LXS_RAW_PLATFORM_BASE:-${LXS_RAW_BASE}/linux}"
+_lxs_lib=""
+if [ -n "${BASH_SOURCE[0]:-}" ]; then
+    _lxs_self=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null) \
+        || _lxs_self=$(realpath "${BASH_SOURCE[0]}" 2>/dev/null) \
+        || _lxs_self="${BASH_SOURCE[0]}"
+    _lxs_lib="$(dirname "$_lxs_self")/../lib/common.sh"
+fi
+if [ -n "$_lxs_lib" ] && [ -r "$_lxs_lib" ]; then
+    # shellcheck disable=SC1090,SC1091
+    . "$_lxs_lib"
+else
+    _lib=$(curl -fsSL "${LXS_RAW_PLATFORM_BASE}/lib/common.sh") || { echo "Failed to fetch lib/common.sh" >&2; exit 1; }
+    eval "$_lib"
+    unset _lib
+fi
+unset _lxs_lib _lxs_self
 export LXS_LOG_FILE="/tmp/lxs_harden.log"
 
 require_root "$0" "$@"