Add vendor dependencies script

.gitignore

@@ -40,4 +40,7 @@ src/seedpass.egg-info/PKG-INFO
 src/seedpass.egg-info/SOURCES.txt
 src/seedpass.egg-info/dependency_links.txt
 src/seedpass.egg-info/entry_points.txt
-src/seedpass.egg-info/top_level.txt
+src/seedpass.egg-info/top_level.txt
+
+# Allow vendored dependencies to be committed
+!src/vendor/

scripts/vendor_dependencies.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+VENDOR_DIR="src/vendor"
+
+# Clean vendor directory
+rm -rf "$VENDOR_DIR"
+mkdir -p "$VENDOR_DIR"
+
+pip download --no-binary :all: -r src/runtime_requirements.txt -d "$VENDOR_DIR"
+
+echo "Vendored dependencies installed in $VENDOR_DIR"