Fix devcontainer smoke test failure from incomplete Claude CLI install

[Copilot]

The Test Devcontainer Actions job was failing in the smoke test because claude --version resolved to the wrapper binary, but the native Claude CLI binary had not been installed. This change makes the devcontainer setup complete that install deterministically during updateContentCommand.

• Root cause

  • @anthropic-ai/claude-code was present, but its native binary placement step had not completed before the smoke test ran.
  • The failure surfaced only when CI executed claude --version inside the built devcontainer.

• Change

  • Update .devcontainer/devcontainer.json to install both CLIs in updateContentCommand.
  • Run Claude’s packaged install.cjs explicitly after the global install so the native claude binary is placed regardless of npm script execution behavior.

• Behavioral impact

  • Keeps the existing devcontainer shape and toolset unchanged.
  • Makes Claude CLI availability explicit and reproducible for CI and local devcontainer builds.

{
  "updateContentCommand": "npm install -g @anthropic-ai/claude-code opencode-ai && node \"$(npm root -g)/@anthropic-ai/claude-code/install.cjs\""
}