add open-vocab YOLO-World engine with CLIP text encoder

- Add OpenVocab engine: YOLO-World ONNX detection with runtime
  vocabulary via CLIP text embeddings (two-input model support)
- Add header-only C++ CLIP BPE tokenizer (no external deps)
- Add detect(cv::Mat) overload to OpenVocab for camera-free testing
- Add standalone test binary (test_open_vocab) using test/assets images
- Add export scripts for YOLO-World and CLIP text encoder (uv/PEP 723)
- Add installation scripts for Linux x64, ARM (Jetson), and Windows
- Update CMakeLists to use find_package(onnxruntime) instead of FetchContent
- Update README and AGENTS with env vars, setup workflow, and test usage

scripts/install_windows.ps1

@@ -0,0 +1,47 @@
+# Install build dependencies for dora-zed on Windows x64.
+# Skips any component that is already installed.
+# Run from an elevated PowerShell prompt.
+#
+# Requirements before running:
+#   - CUDA Toolkit 12.x: https://developer.nvidia.com/cuda-downloads
+#   - CMake 3.21+:        https://cmake.org/download/
+#   - Rust toolchain:     https://rustup.rs
+
+$ErrorActionPreference = "Stop"
+
+$ZED_INSTALL_DIR = "C:\Program Files (x86)\ZED SDK"
+$ORT_VERSION     = "1.24.4"
+$ORT_NAME        = "onnxruntime-win-x64-gpu_cuda13-$ORT_VERSION"
+$ORT_URL         = "https://github.com/microsoft/onnxruntime/releases/download/v$ORT_VERSION/$ORT_NAME.zip"
+$ORT_DEST        = "C:\onnxruntime"
+
+# --- ZED SDK ---
+if (Test-Path $ZED_INSTALL_DIR) {
+    Write-Host ">>> ZED SDK already installed at '$ZED_INSTALL_DIR' — skipping."
+} else {
+    Write-Host ">>> ZED SDK: download the installer from the release page and run it."
+    Write-Host "    https://www.stereolabs.com/developers/release"
+    Write-Host "    After install, ZED SDK will be at '$ZED_INSTALL_DIR'."
+    Write-Host ""
+}
+
+# --- ONNX Runtime ---
+if (Test-Path "$ORT_DEST\lib\onnxruntime.dll") {
+    Write-Host ">>> ONNX Runtime already installed at '$ORT_DEST' — skipping."
+} else {
+    Write-Host ">>> Downloading ONNX Runtime $ORT_VERSION GPU (CUDA 13)..."
+    $tmp = "$env:TEMP\$ORT_NAME.zip"
+    Invoke-WebRequest -Uri $ORT_URL -OutFile $tmp
+
+    Write-Host ">>> Extracting to $ORT_DEST..."
+    Expand-Archive -Path $tmp -DestinationPath $env:TEMP -Force
+    if (Test-Path $ORT_DEST) { Remove-Item $ORT_DEST -Recurse -Force }
+    Move-Item "$env:TEMP\$ORT_NAME" $ORT_DEST
+    Remove-Item $tmp
+
+    Write-Host ">>> ONNX Runtime installed to $ORT_DEST"
+    Write-Host "    Pass it to CMake: cmake .. -DCMAKE_PREFIX_PATH=C:\onnxruntime"
+}
+
+Write-Host ""
+Write-Host ">>> Done."