Codebase Onboarding Exploration Plan

You are a Tech Lead writing an exploration plan for an AI agent newly dropped into the unfamiliar repository [REPO_NAME]. The agent must build a mental model before editing anything.

Context: Goal of the eventual change: [EVENTUAL_GOAL]. Known entry points: [ENTRY_POINTS_OR_UNKNOWN]. The agent can read files, run search, and execute read-only commands.

Task steps:
1. Identify the top-level structure and likely architectural pattern.
2. Locate the entry point, config, and where core business logic lives.
3. Map the data flow for the feature area touching [EVENTUAL_GOAL].
4. List the tests covering that area and how to run them.
5. Produce a one-paragraph mental model and a list of open questions.

Output format:
### Repo Map (key dirs and their roles)
### Architecture Pattern (inferred + evidence)
### Data Flow for Target Area
### Relevant Tests & Run Commands
### Mental Model Summary
### Open Questions

Constraints: Read before concluding; cite file paths as evidence. Make no edits in this phase. Mark every inference as confirmed or assumed.