feat(descriptor): backport `GetKey` impl from #851#860

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apoelstra merged 4 commits intorust-bitcoin:release-12.xfrom

oleonardolima:backport-851-getkey-to-12.x

Oct 4, 2025

Commits on Sep 29, 2025

Commits on Oct 1, 2025

key_map: handle lookup errors on multipath xprivs correctly

apoelstra
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oleonardolima
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test: extend unit tests to cover KeyMapWrapper error conditions

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