chore: Add devcontainer configuration

Had to do some trickery to get Claude settings inside the container, but
we are all good now!

.devcontainer/devcontainer.json

@@ -0,0 +1,34 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+	"name": "Ubuntu",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/base:resolute",
+	"features": {
+		"ghcr.io/jsburckhardt/devcontainer-features/just:1": {},
+		"ghcr.io/devcontainers-community/npm-features/typescript:1": {},
+		"ghcr.io/devcontainers-extra/features/claude-code:2": {},
+		"ghcr.io/devcontainer-community/devcontainer-features/lazygit:1": {},
+		"ghcr.io/rails/devcontainer/features/bun:1": {}
+	},
+	"mounts": [
+		"source=${localEnv:HOME}/.claude,target=/home/vscode/.claude,type=bind",
+		"source=${localEnv:HOME}/.claude.json,target=/home/vscode/.claude.json,type=bind"
+	],
+	"postCreateCommand": "sudo apt install -y ripgrep"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}