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_linux_x64.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# Install build dependencies for dora-zed on Ubuntu 24.04 x86_64 (CUDA 12).
+# Skips any component that is already installed.
+# Uses aria2c for fast parallel downloads if available, otherwise falls back to wget.
+# Downloads are placed in ./tmp relative to this script for inspection.
+set -euo pipefail
+
+ZED_VERSION="5.2"
+ORT_VERSION="1.24.4"
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TMP_DIR="${SCRIPT_DIR}/../tmp"
+mkdir -p "$TMP_DIR"
+
+download() {
+    local url="$1" dest="$2"
+    if command -v aria2c &>/dev/null; then
+        aria2c -x 16 -s 16 -d "$(dirname "$dest")" -o "$(basename "$dest")" "$url"
+    else
+        wget -O "$dest" "$url"
+    fi
+}
+
+# --- ZED SDK ---
+if [ -d /usr/local/zed ]; then
+    echo ">>> ZED SDK already installed at /usr/local/zed — skipping."
+else
+    echo ">>> Downloading ZED SDK ${ZED_VERSION} for Ubuntu 24.04 (CUDA 12)..."
+    download \
+        "https://download.stereolabs.com/zedsdk/${ZED_VERSION}/cu12/ubuntu24" \
+        "${TMP_DIR}/ZED_SDK.run"
+    chmod +x "${TMP_DIR}/ZED_SDK.run"
+    echo ">>> Installing ZED SDK (silent)..."
+    sudo "${TMP_DIR}/ZED_SDK.run" -- silent skip_python skip_tools
+fi
+
+# --- ONNX Runtime (C++ GPU, installs to /usr/local) ---
+if [ -f /usr/local/lib64/libonnxruntime.so ] && [ -d /usr/local/include/onnxruntime ]; then
+    echo ">>> ONNX Runtime already installed — skipping."
+else
+    echo ">>> Downloading ONNX Runtime ${ORT_VERSION} GPU..."
+    download \
+        "https://github.com/microsoft/onnxruntime/releases/download/v${ORT_VERSION}/onnxruntime-linux-x64-gpu-${ORT_VERSION}.tgz" \
+        "${TMP_DIR}/onnxruntime-linux-x64-gpu-${ORT_VERSION}.tgz"
+    echo ">>> Extracting..."
+    tar -xzf "${TMP_DIR}/onnxruntime-linux-x64-gpu-${ORT_VERSION}.tgz" -C "${TMP_DIR}"
+    echo ">>> Installing ONNX Runtime to /usr/local..."
+    sudo mkdir -p /usr/local/include/onnxruntime
+    sudo cp -r "${TMP_DIR}/onnxruntime-linux-x64-gpu-${ORT_VERSION}/include/"* /usr/local/include/onnxruntime/
+    sudo mkdir -p /usr/local/lib64
+    sudo cp -r "${TMP_DIR}/onnxruntime-linux-x64-gpu-${ORT_VERSION}/lib/"* /usr/local/lib64/
+    sudo ldconfig
+fi
+
+echo ">>> Done. You can now run: mkdir -p build && cd build && cmake .. && make install"
+echo ">>> Downloaded files are in ${TMP_DIR}"