Align terminology with BOLTs: rename blinding → path_key #71
Description
The current codebase still uses the term blinding (and derivatives such as blindingPoint, deriveBlinding, etc.) in contexts that, under the updated Lightning specifications, have been renamed to path_key.
To maintain consistency with the latest BOLT-0002 and BOLT-0004 revisions (lightning/bolts@5e9ea22), the terminology in this library should be updated accordingly.