Add RED4ext release packaging

tools/package_red4ext_mod.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+timestamp="$(date +%Y%m%d-%H%M%S)"
+staging="$repo_root/build/package/EdgeWeightGPS-$timestamp"
+dist_dir="$repo_root/dist"
+zip_path="$dist_dir/EdgeWeightGPS-red4ext-$timestamp.zip"
+
+dll_path="$("$repo_root/tools/build_red4ext_shim.sh" | tail -n 1)"
+plugin_out="$staging/red4ext/plugins/EdgeWeightGPS"
+
+mkdir -p "$plugin_out" "$dist_dir"
+install -m 0644 "$dll_path" "$plugin_out/EdgeWeightGPS.dll"
+install -m 0644 "$repo_root/presets/momentum/default.bin" "$plugin_out/momentum_weights.bin"
+install -m 0644 "$repo_root/presets/solver_weights/vanilla.bin" "$plugin_out/solver_weights.bin"
+install -m 0644 "$repo_root/packaging/EdgeWeightGPS-README.txt" "$plugin_out/README.txt"
+
+(
+  cd "$staging"
+  python3 -m zipfile -c "$zip_path" red4ext
+)
+
+printf '%s\n' "$zip_path"