Simplifies the active Windows build path around Boost.Beast/OpenSSL, fixes VS2017/clang-cl compatibility, and removes unused BearSSL/WinHTTP remnants so the project builds and tests cleanly.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Repair streaming callback/error handling and make file/session handling safer so the core API behaves correctly under real usage.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>