Guard Proton DLL setup against stale Windows binaries

ddiff --git a/tools/setup-openvibe-bin.sh b/tools/setup-openvibe-bin.sh
iindex 59319f3..788e3f0 100755
---- a/tools/setup-openvibe-bin.sh
++++ b/tools/setup-openvibe-bin.sh
@@@ -65,6 +65,11 @@ fi
  echo "[openvibe] linux bin/linux64 compatibility links ready"
  
  # Windows/Proton modules. These are optional on Linux until a Windows build has run.
++# OPENVIBE_GUARDED_WINDOWS_DLL_COPY_BEGIN
++# Do NOT blindly copy any client.dll/server.dll found under the SDK tree. The
++# Linux build produces client.so/server.so; Proton needs a separate 32-bit
++# Windows PE client.dll from the GitHub Actions Windows workflow. Copying a
++# stock/stale DLL here makes Proton launch but leaves ov_join/ov_menu unknown.
  win_client_candidates=(
    "$SDK_HL2MP_WIN_BIN/client.dll"
    "$SDK_HL2MP_WIN_BIN/win32/client.dll"
@@@ -78,21 +83,69 @@ win_server_candidates=(
    "$ROOT/engine/source-sdk-2013/src/game/server/Release/server.dll"
  )
  
--for src in "${win_client_candidates[@]}"; do
--  if copy_if_exists "$src" "$MOD_BIN/client.dll"; then break; fi
--done
--for src in "${win_server_candidates[@]}"; do
--  if copy_if_exists "$src" "$MOD_BIN/server.dll"; then break; fi
++is_patched_openvibe_client_dll() {
++  local dll="$1"
++  [[ -f "$dll" ]] || return 1
++  command -v strings >/dev/null 2>&1 || return 1
++  strings -a "$dll" | grep -Eq 'ov_join|ov_menu|OpenVibe'
++}
++
++is_patched_openvibe_server_dll() {
++  local dll="$1"
++  [[ -f "$dll" ]] || return 1
++  command -v strings >/dev/null 2>&1 || return 1
++  strings -a "$dll" | grep -Eq 'ov_js_status|ov_js_cmd|OpenVibe'
++}
++
++try_copy_windows_pair() {
++  local client="$1" server="$2"
++  [[ -f "$client" && -f "$server" ]] || return 1
++  if ! is_patched_openvibe_client_dll "$client"; then
++    echo "[openvibe] skipping stale Windows client.dll candidate: $client"
++    return 1
++  fi
++  if ! is_patched_openvibe_server_dll "$server"; then
++    echo "[openvibe] skipping stale Windows server.dll candidate: $server"
++    return 1
++  fi
++  install -D -m 0644 "$client" "$MOD_BIN/client.dll"
++  install -D -m 0644 "$server" "$MOD_BIN/server.dll"
++  echo "[openvibe] copied patched Windows/Proton DLL pair"
++  return 0
++}
++
++copied_windows=0
++for client in "${win_client_candidates[@]}"; do
++  for server in "${win_server_candidates[@]}"; do
++    if try_copy_windows_pair "$client" "$server"; then
++      copied_windows=1
++      break 2
++    fi
++  done
  done
  
++if [[ "$copied_windows" != "1" ]]; then
++  echo "[openvibe] no patched Windows/Proton DLL pair found in SDK outputs; leaving existing game/openvibe.games/bin/*.dll alone"
++fi
++
  if [[ -f "$MOD_BIN/client.dll" ]]; then
--  echo "[openvibe] Windows/Proton client.dll present"
++  if is_patched_openvibe_client_dll "$MOD_BIN/client.dll"; then
++    echo "[openvibe] Windows/Proton client.dll present and patched"
++  else
++    echo "[openvibe] WARNING: Windows/Proton client.dll present but lacks ov_join/ov_menu/OpenVibe; install CI artifact before Proton testing" >&2
++  fi
  else
--  echo "[openvibe] Windows/Proton client.dll not present yet; build on Windows to enable Proton in-game client DLL commands"
++  echo "[openvibe] Windows/Proton client.dll not present yet; install the GitHub Actions Windows DLL artifact to enable Proton in-game commands"
  fi
  
  if [[ -f "$MOD_BIN/server.dll" ]]; then
--  echo "[openvibe] Windows server.dll present"
++  if is_patched_openvibe_server_dll "$MOD_BIN/server.dll"; then
++    echo "[openvibe] Windows server.dll present and patched"
++  else
++    echo "[openvibe] WARNING: Windows server.dll present but lacks OpenVibe server strings" >&2
++  fi
  else
    echo "[openvibe] Windows server.dll not present yet"
  fi
++# OPENVIBE_GUARDED_WINDOWS_DLL_COPY_END
++