Convert "X returns the Y" / "X holds Y" / "X represents Y" style
comments to concrete usage examples across database/, logging/, and
mining/ packages. Comments now show how to call the function with
realistic values instead of restating what the signature already says.
Co-Authored-By: Charon <charon@lethean.io>
AX Principle 2: comments must show how to call the function with real
values, not restate what the type signature already says. All six
HashrateStore interface methods now carry concrete call-site examples.
Co-Authored-By: Charon <charon@lethean.io>