the key in chain-source-esplora.test.ts was labelled a published test vector and
was not one — it was the owner's live bip84 account xpub, pulled from the
database during an earlier verification and pasted in.
it cannot spend, but it discloses every address that wallet will ever use and
its whole history, permanently. replaced with the bip84 spec's own vector,
derived in the file from the published mnemonic so its provenance can be checked
rather than taken on trust, and pinned by an assertion against the spec's first
address so a future substitution fails loudly.
this does not remove the key from history. that needs a rewrite of 5c38236.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
