feat: add GE-Proton auto-install to both SWBF2 setup scripts

Both scripts now download and install GE-Proton10-34 if not already present:
- setup-swbf2-linux.sh: installs to ~/.steam/root/compatibilitytools.d/
- setup-swbf2-wolf.sh: installs into the WolfSteam container via docker cp + tar

Both pause after install and prompt the user to set GE-Proton in Steam
(Compatibility → Force) before continuing, since that step requires the GUI.

Update docs to reflect GE-Proton is now handled automatically.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D8ckUJQtj1pH8jtAddBDZs

scripts/setup-swbf2-linux.sh

@@ -38,12 +38,12 @@ set -euo pipefail
 
 APPID="1237950"
 WRAPPER_PATH="$HOME/.local/bin/ea_install.sh"
+GE_PROTON_VERSION="GE-Proton10-34"
 
 echo "=== SWBF2 (2017) Linux Steam Setup ==="
 echo ""
 
 # ── Locate Steam home ───────────────────────────────────────────────────────
-# Steam can live in either of two locations depending on install method.
 find_steam_home() {
     for candidate in \
         "$HOME/.steam/steam" \
@@ -63,6 +63,31 @@ STEAM_HOME=$(find_steam_home) || {
 }
 echo "Steam home: $STEAM_HOME"
 
+# ── Install GE-Proton if not present ───────────────────────────────────────
+GEP_DIR="$HOME/.steam/root/compatibilitytools.d"
+mkdir -p "$GEP_DIR"
+if [ -d "$GEP_DIR/$GE_PROTON_VERSION" ]; then
+    echo "GE-Proton: $GE_PROTON_VERSION already installed"
+else
+    echo "Installing $GE_PROTON_VERSION..."
+    GEP_URL="https://github.com/GloriousEggroll/proton-ge-custom/releases/download/$GE_PROTON_VERSION/$GE_PROTON_VERSION.tar.gz"
+    GEP_TMP="/tmp/$GE_PROTON_VERSION.tar.gz"
+    if ! curl -L --progress-bar -o "$GEP_TMP" "$GEP_URL"; then
+        echo "ERROR: Download failed. Check your internet connection and try again."
+        exit 1
+    fi
+    tar -xzf "$GEP_TMP" -C "$GEP_DIR"
+    rm -f "$GEP_TMP"
+    echo "GE-Proton installed to: $GEP_DIR/$GE_PROTON_VERSION"
+    echo ""
+    echo "IMPORTANT: Restart Steam now, then:"
+    echo "  Right-click SWBF2 → Properties → Compatibility"
+    echo "  → Force a specific Steam Play compatibility tool → $GE_PROTON_VERSION"
+    echo "Then re-run this script."
+    echo ""
+    read -rp "Press Enter after you have restarted Steam and set GE-Proton, or Ctrl+C to abort..."
+fi
+
 PFX_C="$STEAM_HOME/steamapps/compatdata/$APPID/pfx/drive_c"
 MSI="$PFX_C/ea_app.msi"