spelunk — understand before touching

Your output is context other skills consume. The map must be compact enough to inject later without tax, and every claim in it must be tied to a real file path you actually saw.

When NOT to use

• PROJECT_CONTEXT.md at the root already covers the need and is fresh — read that instead.
• The question is answerable by reading one obvious file. Just read it.
• Empty or greenfield repository — say that and stop.

Prerequisites

Filesystem + search only. Git enriches (churn, history) but is optional. No network required or used.

Modes