Implement regtest-only BIP448#1

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bip448:masterfrom

instagibbs:2026-06-bip448

Commits on Jun 18, 2026

chainparams: introduce a deployment for OP_TEMPLATEHASH

darosior
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instagibbs
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script: introduce verify flags for OP_TEMPLATEHASH

darosior
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instagibbs
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script: implement OP_TEMPLATEHASH

darosior
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instagibbs
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Commits on Jun 24, 2026

Commits on Jun 25, 2026

qa: feature_taproot coverage for OP_CHECKSIGFROMSTACK and OP_INTERNALKEY
instagibbs
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