Add dev container configuration

.devcontainer/devcontainer.json

@@ -0,0 +1,30 @@
+{
+    "name": "DS Development Container",
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+        "ghcr.io/devcontainers/features/cmake:1": {
+            "version": "latest"
+        },
+        "ghcr.io/devcontainers/features/python:1": {
+            "version": "latest"
+        },
+        "ghcr.io/devcontainers/features/node:1": {
+            "version": "latest"
+        }
+    },
+    "postCreateCommand": ".devcontainer/post-create.sh",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-vscode.cpptools-extension-pack",
+                "ms-vscode.cmake-tools",
+                "clang-format.vscode-clang-format",
+                "ms-python.python",
+                "ms-python.vscode-pylance",
+                "ms-pyright.pyright",
+                "charliermarsh.ruff",
+                "biomejs.biome"
+            ]
+        }
+    }
+}

.devcontainer/post-create.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -euo pipefail
+
+# Install apt packages
+sudo apt-get update
+sudo apt-get install -y libgtest-dev clang-format
+
+# Install uv (Python package manager)
+curl -LsSf https://astral.sh/uv/install.sh | sh
+
+# Add uv to PATH for this script and future sessions
+export PATH="$HOME/.local/bin:$PATH"
+echo 'export PATH="$HOME/.local/bin:$PATH"' >> "$HOME/.bashrc"
+
+# Install Python dependencies
+uv sync --locked --extra dev
+
+# Install Node.js dependencies
+npm ci
+
+# Install emscripten to a persistent location
+EMSDK_DIR="$HOME/emsdk"
+if [ ! -d "$EMSDK_DIR" ]; then
+    git clone https://github.com/emscripten-core/emsdk.git "$EMSDK_DIR"
+else
+    git -C "$EMSDK_DIR" pull
+fi
+(
+    cd "$EMSDK_DIR"
+    ./emsdk install latest
+    ./emsdk activate latest
+)
+
+# Add emsdk to shell config for future sessions
+echo "source $EMSDK_DIR/emsdk_env.sh" >> "$HOME/.bashrc"
+
+# Install pre-commit hooks
+uv run pre-commit install