BIP-324 horizontal: test suite (62/62), bench_unified section, BENCHMARKS.md, C example
- cpu/tests/test_bip324.cpp: 10 test sections, 62 checks covering
HKDF-SHA256, ChaCha20-Poly1305 AEAD, ElligatorSwift, Bip324Cipher,
Bip324Session, packet sequences, determinism, variable sizes,
tamper resistance, and random-key sessions
- cpu/CMakeLists.txt: register test_bip324_standalone target + selftest
- cpu/tests/run_selftest.cpp: add BIP-324 module (gated by SECP256K1_BIP324)
- cpu/bench/bench_unified.cpp: add BIP-324 ENCRYPTED TRANSPORT section
with ElligatorSwift, HKDF, AEAD, and Session benchmarks + summary
- docs/BENCHMARKS.md: add BIP-324 benchmark tables and bench target
- examples/c_example/main.c: add [11] BIP-324 session demo (create,
handshake, encrypt, decrypt) via C ABI
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