BIP 448 support by W0xlt#1
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Expose names for the BIP348, BIP349, and BIP446 opcode bytes used by Bitcoin Inquisition signet. They remain aliases for the current OP_SUCCESSx bytes so script construction can use the proposal names without changing TapScript classification. Add coverage for the alias byte values, builder output, and current OP_SUCCESSx classification behavior.
Add a TemplateHash tagged-hash type and SighashCache helpers for computing the BIP446 OP_TEMPLATEHASH message used by Bitcoin Inquisition signet scripts. The helper commits to version, lock time, sequences, outputs, input index, and this input's annex data while intentionally leaving prevouts and spent amounts out of scope. Share the BIP341 annex hashing logic, add raw BIP340 signing helpers for CHECKSIGFROMSTACK use, and cover the behavior with local BIP446 vectors plus length and input-index error tests.
Add examples that build the common OP_TEMPLATEHASH OP_INTERNALKEY OP_CHECKSIGFROMSTACK Taproot script and sign a TemplateHash for a script-spend witness. These examples demonstrate the local construction and signing API without implying consensus validation. Document the intended Bitcoin Inquisition signet scope, the non-consensus limitations, the TemplateHash commitments, and the raw CSFS signing convention.
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This is work by @w0xlt to introduce BIP 448 in rust-bitcoin master.