UltrafastSecp256k1 v3.14.0

Added — Language Bindings (12 languages, 41-function C API parity) Java — 22 new JNI functions + 3 helper classes (RecoverableSignature, WifDecoded, TaprootOutputKeyResult): full coverage of ECDSA sign/verify, DER encoding, recovery, ECDH, Schnorr, BIP-32, BIP-39, taproot, WIF, address encoding, tagged hash Swift — 20 new functions: DER encode/decode, recovery sign/recover, ECDH, tagged hash, BIP-32/39, taproot, WIF, address encoding React Native — 15 new functions: DER, recovery, ECDH, Schnorr, BIP-32/39, taproot, WIF, address, tagged hash Python — 3 new functions: ctx_clone(), last_error(), last_error_msg() Rust — 2 new functions: last_error(), last_error_msg() Dart — 1 new function: ctx_clone() Go, Node.js, C#, Ruby, PHP — already complete (verified, no changes needed) 9 new binding READMEs — c_api, dart, go, java, php, python, ruby, rust, swift Selftest report API — SelftestReport and SelftestCase structs in selftest.hpp; tally() refactored for programmatic reporting Fixed — Docume