RawConfig and MiningProfile had description-style comments restating what
the types are rather than showing how to use them (AX Principle 2 violation).
Replaced with concrete call-site examples demonstrating real usage patterns.
Co-Authored-By: Charon <charon@lethean.io>
RawConfig.UnmarshalJSON used errors.New() (banned import) despite the
package already providing ErrInternal() for exactly this purpose.
Co-Authored-By: Charon <charon@lethean.io>
