We use JSDoc for documentation, but these annotations
were not being validated. This meant that type information
could become outdated or incorrect without any warning.
This commit introduces the TypeScript compiler (`tsc`) as a static
analysis tool to leverage our existing JSDoc comments.
To support this, JSDoc annotations across the codebase have been
improved for accuracy. Additionally, the `varint` module now uses a
custom `VarIntError` class for better type inference and error handling.
A new `typecheck` script has been added to `package.json` to run this
validation.
