Merge branch 'v4.2-dev' into feat/index-only-read-completion

Both sides fixed the #4495 doc_lazy_continuation lint in the delete
builder: v4.2-dev's #4498 kept sign()'s Arguments/Returns block above
the extracted helper with a separator line, this branch moved it back
onto sign() itself. Kept this branch's placement — the block documents
sign(), and it already lives there exactly once.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: QuantumExplorer