Add libsecp256k1 v0.7.1 as src/secp256k1 submodule and introduce
crypto_ecdsa / crypto_ecdh wrappers as drop-in replacements for the
OpenSSL ECDSA_verify / ECDSA_sign / ECDH_compute_key call sites used
by key.cpp and smessage.cpp. Wrappers preserve on-chain compatibility
(lax DER parsing, 65-byte recoverable compact sigs, SEC1 priv-key
DER round-trip, raw-X ECDH output for smsg KDF).
CMake wires the submodule and new sources into the build. Mid-refactor;
landing as a checkpoint before stacking sync-pipeline work on top.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Port codebase to build with OpenSSL 3.x and Boost 1.90+:
- Rewrite bignum.h to use BIGNUM* pointer instead of inheriting from opaque BIGNUM
- Fix ECDSA_SIG, EVP_CIPHER_CTX, HMAC_CTX opaque type access across key.cpp, crypter.cpp, smessage.cpp
- Modernize Boost.Asio API (io_context, resolver, executor) in trianglesrpc.cpp
- Remove embedded Tor v2 client (incompatible with OpenSSL 3.x), keep Tor v3 SOCKS5 approach
- Update header logo to Cryptographic Triangles branding (300x63)
- Replace Bittrex exchange link with Pinball (313.cash) across all locales
- Fix MSYS2/MinGW64 build: linker flags, Boost library names, miniupnpc static linking
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>