[wieslawsoltes]

Problem and result

Once PR #909's macOS 12 floating-conversion fix let NuGet Build osx-arm64 compile, the job exposed a latent linker failure: webscene_native_engine_tests calls native_websocket_transport from its white-box WebSocket fairness fixture, but the class's implementation was compiled only into the production shared library with restricted C++ exports. The test target now compiles webscene_native_websocket.cpp directly, as it already does for its DOM fixture, so the test links without broadening the engine ABI.

Validation and stack

• Source review: the target already links ixwebsocket; the new source is the only implementation of the missing class methods and is confined to the test executable. git diff --check passes.
• The updated top commit 10d9b939 adds a dedicated webscene_native_websocket_file_reader CTest filter. It must link and run cross-socket fairness, browser WebSocket, and FileReader behavior on macOS 12 before merge. This CI job is the complete gate because the cleaned local SDK/V8 cache is intentionally absent.
• GitHub stack #912: bottom PR Restore macOS 12 native form conversion and package CI #909 (macOS 12 floating conversion), this top PR Link WebSocket transport into native engine white-box tests #911 (test link). Validate the top, then merge the ready stack atomically.

Closes #910.

The first full package build after the link fix compiled and linked 91 tests and passed 84; seven broader runtime tests failed (details are being triaged separately). The new focused CTest isolates this PR’s required behavior.