Files
palladiumcore/src
davide3011 478e8fc306 build(secp256k1): upgrade to bitcoin-core v24.2 with taproot modules
Synchronize secp256k1 library to bitcoin-core/secp256k1 as of Bitcoin Core
v24.2, enabling cryptographic primitives required for Taproot (BIP340/341).

Changes:
- Upgrade src/secp256k1 from bitcoin v24.2 tag
- Enable experimental modules via configure.ac:
  * --enable-module-extrakeys (BIP340 x-only public keys)
  * --enable-module-schnorrsig (BIP340 Schnorr signatures)
  * --enable-module-recovery (ECDSA pubkey recovery, pre-existing)
- Update MSVC build configuration with corresponding preprocessor defines
- Regenerate autotools build files via autogen.sh

Module verification:
- ENABLE_MODULE_EXTRAKEYS: provides secp256k1_xonly_pubkey APIs
- ENABLE_MODULE_SCHNORRSIG: provides secp256k1_schnorrsig APIs
- ENABLE_MODULE_RECOVERY: provides secp256k1_ecdsa_recover APIs

Build targets:
- Linux/Unix: verified with autotools + quick-build.sh
- Windows MSVC: configuration updated (requires Windows build verification)

Testing:
- Static library compiled successfully (1.6M)
- All header files present (extrakeys.h, schnorrsig.h)
- Regtest functional tests passed:
  * Transaction signing/verification
  * ECDSA operations
  * Block mining and validation
- No regressions on existing ECDSA functionality

This commit provides the cryptographic foundation for subsequent Taproot
implementation (BIP340/341/342) without modifying consensus or wallet logic.
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