## Summary
- Install clang 18 from apt.llvm.org for the Linux release build.
- Use clang-18 and clang++-18 for Linux native module rebuilds.
- Keep the release runner on Ubuntu 22.04 to preserve the Linux glibc
baseline.

## Why
The previous clang attempt confirmed the compiler changed, but Ubuntu
22.04's preinstalled clang 15 still failed Electron 43's V8 headers
because std::source_location was unavailable. A newer clang should
handle that C++20 header path while avoiding a runner upgrade to Ubuntu
24.04.

## Testing
Not run per request.

#skip-bugbot

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