# Copilot Instructions

## System Requirements

This project targets **retro systems** (Windows 3.11, Windows 98, FreeDOS).
The UI must work in period-appropriate browsers:

- **No JavaScript** — all interactivity must be server-side.
- **No CSS** — use HTML attributes (`border`, `cellpadding`, `cellspacing`) for layout.
- **Use table-based layouts** to arrange elements side by side.
- Keep HTML simple: plain `<form>`, `<table>`, `<input>`, `<a>` elements only.

## Testing

- **All new functionality must have unit tests.**
- Service-layer tests go in `src/test/java/.../service/GitServiceTest.java` and use
  real JGit repositories created in `@TempDir` directories.
- Controller tests go in `src/test/java/.../controller/RepoControllerTest.java` and
  use `@WebMvcTest` with `@MockitoBean` for the service layer.
- Run `./gradlew test` to verify all tests pass before considering a change complete.

## Tech Stack

- Java 25, Spring Boot 4.0, Thymeleaf, Gradle
- JGit for all Git operations (no shelling out to `git`)
- Lombok for boilerplate reduction (`@Getter`, `@Setter`, `@RequiredArgsConstructor`)