Feat/silentpayments dleq multisigner#142
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P2SH-P2WPKH: validate the redeem-script hash160 against the output script pubkey before trusting it. Previously any push in script_sig was accepted without checking the commitment, which would silently allow malformed inputs to pass. P2TR: the old check for a script-path spend indexed the last witness item as [1..33] without verifying length, which panics on items shorter than 33 bytes. Tighten the guard to control_block.len() >= 33 and only check effective_stack >= 2 (key-path spends have a single witness item). Extract last_push (returns the last data push in a push-only script) and witness_compressed_pubkey (verifies compressed pubkey + hash160 match) as helpers, removing three near-identical match blocks. Also includes PublicTweakData::new signature change from the two-NonEmptyArray pattern to &TransactionInputs (companion to the TransactionInputs commit).
…roduce `PublicTweakData`
Introduce BIP-374 DLEQ-backed `PartialSenderEcdhShare` and `GlobalSenderEcdhShare` types, with `TransactionSharedSecret` constructors for global and per-input share aggregation. Add `dleq-native` and `dleq-standalone` feature flags via rust-dleq while keeping the legacy `PartialSecret` sending API for backward compatibility.
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PartialSenderEcdhShareandGlobalSenderEcdhSharefor multi-signer flows.TransactionSharedSecret::new_from_global_shareandnew_from_partial_shareswith vin coverage checks.dleq-native/dleq-standalonefeature flags viarust-dleq; legacyPartialSecretAPI retained.