chore: add devcontainer configuration and post-create setup script

Author: ervwalter

.devcontainer/devcontainer.json

@@ -0,0 +1,31 @@
+// 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:noble",
+	"features": {
+		"ghcr.io/devcontainers/features/dotnet:2": {},
+		"ghcr.io/devcontainers/features/github-cli:1": {},
+		"ghcr.io/devcontainers/features/node:1": {},
+		"ghcr.io/va-h/devcontainers-features/uv:1": {},
+		"ghcr.io/devcontainers-extra/features/direnv:1": {},
+		"ghcr.io/devcontainers-extra/features/tmux-apt-get:1": {}
+	},
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "bash .devcontainer/post-create.sh",
+	// Mount the host's Claude configuration directory
+	"mounts": [
+		"source=${localEnv:HOME}/.claude,target=/home/vscode/.claude,type=bind,consistency=consistent"
+	]
+	// 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"
+}

.devcontainer/post-create.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Post-creation script for TrendWeight devcontainer
+set -e
+
+echo "🚀 Running post-create setup..."
+
+# Install Ruby (needed for tmuxinator)
+echo "📦 Installing Ruby..."
+sudo apt-get update
+sudo apt-get install -y ruby ruby-dev
+
+# Install tmuxinator
+echo "📦 Installing tmuxinator..."
+sudo gem install tmuxinator
+
+# Create tmuxinator config directory
+echo "📁 Setting up tmuxinator config directory..."
+mkdir -p ~/.config/tmuxinator
+
+# Install Claude Code
+echo "📦 Installing Claude Code..."
+npm install -g @anthropic-ai/claude-code
+
+# Setup direnv shell integration
+echo "🔧 Setting up direnv shell integration..."
+# Add direnv hook to bash profile
+if ! grep -q "direnv hook bash" ~/.bashrc; then
+    echo 'eval "$(direnv hook bash)"' >> ~/.bashrc
+fi
+# Add direnv hook to zsh profile (if zsh is available)
+if command -v zsh >/dev/null 2>&1 && [ -f ~/.zshrc ]; then
+    if ! grep -q "direnv hook zsh" ~/.zshrc; then
+        echo 'eval "$(direnv hook zsh)"' >> ~/.zshrc
+    fi
+fi
+
+echo "✅ Post-create setup completed!"