KarpelesLab / outscript / 24376241604

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add TaprootSigner interface and expose P2TR helpers

BtcTxSign.Key now accepts any signer implementing TaprootSigner
(SignTaproot(sighash) -> 64-byte sig) in addition to *secp256k1.PrivateKey,
unblocking TSS / MuSig2 / FROST / HSM / mock signers that cannot hand out a
raw scalar for the BIP-341 tweak.

Also export TaprootTweak and BtcTx.TaprootSighash so external signers can
derive the aggregate output key and the sighash digest offline, and add a
p2tr branch to BtcTxInput.Prefill (witness = one 64-byte stub sig, exact
size) so fee estimation works before the real signature is available.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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