Nesty

Enables error classes to nest other exceptions, preserving the original error chain for debugging, as demonstrated with explicit nesting in the HappyError example.

Automatically nests rescued errors when raising new errors without explicit passing, simplifying code by reducing boilerplate in rescue blocks.

Formats stacktraces to include messages from all nested errors at appropriate lines, maintaining readability, illustrated with the A, B, C example in the README.

Adds nesting capability by including a module or inheriting from a base class, making it easy to integrate into existing error classes with minimal changes.