- Add secp256k1 auto-building rule for x64 target
- Fix customer build errors with missing secp256k1/.libs/libsecp256k1.a
- Force clean rebuild when secp256k1 library is missing
- Customers can now run 'make' directly without manual dependency building
- Maintains existing ARM64 cross-compilation auto-building functionality
- Complete C library template with OpenSSL-based crypto
- Comprehensive build system (Makefile, build.sh)
- Example code and test suite
- Documentation and usage guides
- Cross-platform compatibility (x64/ARM64)
- Production-ready structure for C library projects
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