[sheredom]

Summary

• Follow the approach in Keep NetBSD 9.4 CI coverage without retired pkgsrc packages utest.h#194: keep NetBSD 9.4 coverage without installing CMake from the unavailable 9.x pkgsrc repository.
• Build the test suite and helper executables with the VM's base C/C++ compilers, then run the full suite to preserve coverage of the pre-10.0 code path.
• Retain full CMake/CTest runs on NetBSD 10.1, FreeBSD, and OpenBSD.

Validation

• Base-compiler build/run sequence passed locally: 444 tests passed.
• Workflow YAML parsing and git diff --check passed.
• Reviewed with no correctness blockers; NetBSD 9.4 VM-specific validation remains for CI.

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