dplassgit/d2lang

AI Summary: This issue requests an upgrade of the Google Truth testing library to version 1.4.0. A key change in this version is that the `Truth8` artifact, previously used for Java 8 compatibility, has been folded into the main `Truth` library, meaning projects should now use the singular `Truth` dependency.

AI Summary: This issue proposes refactoring existing code by replacing usages of the `@AutoValue` annotation with Java records. The task is categorized as a cleanup effort and is considered a good first issue, suggesting a straightforward refactoring task.

AI Summary: This issue proposes refactoring the `d2lang` repository by replacing instances where unique strings (likely identifiers or labels, often generated using incrementing `id` variables as indicated by `id++` patterns) are created manually. The goal is to standardize this process by utilizing a dedicated utility function, `Labels.nextLabel`, to improve code consistency and maintainability.

AI Summary: The `Labels.java` class, currently located within the `codegen` package, needs to be moved to a more general or common package. This refactoring is intended because its functionality is applicable throughout the project, not exclusively for code generation, making it a cleanup task suitable for new contributors.