Add devcontainer CLI instructions

[cknitt]

Summary

• document how to install the Dev Container CLI
• add commands for creating the container and opening a shell
• clarify that building the Dockerfile directly does not install Dev Container features or run lifecycle commands
• ignore the CLI-generated devcontainer-lock.json

Motivation

The development container relies on features declared in devcontainer.json to install tools such as Node.js. This was not clear when using the configuration outside VS Code, and building the Dockerfile directly results in an incomplete development environment.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-07T12:23:58.298299Z	2cf5c94	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 2cf5c94e4a

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Keep the feature lockfile under version control

When contributors create this container from separate clean checkouts, ignoring the generated lockfile means each checkout independently resolves the floating Feature references (github-cli:1 with latest and node:1). This can install different Feature implementations over time and undermines the documented stable environment; commit devcontainer-lock.json so all contributors use the same resolved versions and integrity hashes.

Useful? React with 👍 / 👎.

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commit: 2cf5c94