node devcontainer with AI harness tooling

devcontainer.json

{
  "name": "FE+BE Development Container",
  "image": "mcr.microsoft.com/devcontainers/javascript-node:24-bookworm",

  // Configure tool-specific properties.
  "customizations": {
    "vscode": {
      "settings": {
        "editor.formatOnSave": true,
        "editor.defaultFormatter": "esbenp.prettier-vscode",
        "editor.codeActionsOnSave": {
          "source.fixAll.eslint": "explicit"
        },
        "eslint.validate": ["javascript", "javascriptreact", "typescript", "typescriptreact"]
      },
      "extensions": [
        "dbaeumer.vscode-eslint",
        "esbenp.prettier-vscode",
        "bradlc.vscode-tailwindcss",
        "vitest.explorer",
        "drizzle-team.drizzle-journal"
      ]
    }
  },

  // Enable host.docker.internal resolution on Linux hosts (native on macOS/Windows)
  "runArgs": ["--add-host=host.docker.internal:host-gateway"],

  // Use 'postCreateCommand' to run commands after the container is created.
  // We use sudo corepack enable to ensure the symlinks can be created in /usr/local/bin.
  "postCreateCommand": "sudo corepack enable && pnpm install && sudo npm install -g opencode-ai @google/gemini-cli @github/copilot && curl -fsSL https://antigravity.google/cli/install.sh | bash",

  // Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
  "remoteUser": "node",

  // Add the local bin path to PATH so agy is accessible
  "remoteEnv": {
    "PATH": "${containerEnv:PATH}:/home/node/.local/bin"
  },

  // Share auth and configuration directories between host and container
  "mounts": [
    "source=${localEnv:HOME}/.config/opencode,target=/home/node/.config/opencode,type=bind,consistency=cached",
    "source=${localEnv:HOME}/.local/share/opencode,target=/home/node/.local/share/opencode,type=bind,consistency=cached",
    "source=${localEnv:HOME}/.gemini,target=/home/node/.gemini,type=bind,consistency=cached",
    "source=${localEnv:HOME}/.config/gh,target=/home/node/.config/gh,type=bind,consistency=cached",
    "source=${localEnv:HOME}/.copilot,target=/home/node/.copilot,type=bind,consistency=cached",
    "source=${localEnv:HOME}/.config/gcloud,target=/home/node/.config/gcloud,type=bind,consistency=cached"
  ],

  // Forward credential/token environment variables if they are set on the host
  "containerEnv": {
    "GEMINI_API_KEY": "${localEnv:GEMINI_API_KEY}",
    "COPILOT_GITHUB_TOKEN": "${localEnv:COPILOT_GITHUB_TOKEN}",
    "GH_TOKEN": "${localEnv:GH_TOKEN}",
    "GITHUB_TOKEN": "${localEnv:GITHUB_TOKEN}"
  }
}