Set up an Exercode course repository

Prepare the repository tooling required to author and evaluate Exercode course content. Do not create or modify learning content.

Tracked tooling setup

The repository tracks its tooling instead of ignoring it.

package.json contains private: true, type: "module", and the repository name.
@exercode/problem-utils is an exact production dependency at its latest published version.
bun.lock is tracked.
Bun and Node.js are managed by mise with exact versions. Preserve an existing mise.toml, .mise.toml, or .tool-versions; when none exists, create .tool-versions.
.gitignore includes node_modules/, .DS_Store, and .tmp/. It does not ignore package.json or bun.lock.
Preserve compatible existing runtime versions, tools, dependencies, and scripts. Do not replace an existing mise or package setup wholesale.