Add in-class documentation to Result

This task is to enable class magic methods like `__repr__` and to create `help()` or `what_can_i_do()` methods that print the doc strings of available attributes and encourage use of the API documentation.

Start by locating the Result class and reviewing its available attributes, existing class methods, and API documentation. Clarify the intended behavior of __repr__, help(), and what_can_i_do(), then consider the work complete when these entry points document the available API as described.

Written by the indexing model from the issue text.