test: defer test_utxo gtest discovery to PRE_TEST mode - #90
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gtest_discover_tests(test_utxo) ran discovery as a POST_BUILD step, which under cmake --build -j$(nproc) races concurrent test targets and can spuriously mark heavy targets (v37_test) Not Run. DISCOVERY_MODE PRE_TEST defers enumeration to ctest runtime, removing it from the parallel build graph entirely.
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test-infra only: change test_utxo gtest discovery to PRE_TEST, eliminating build-parallel race on v37-dev. Validated: 14/14 UTXOTest pass, BUILD_RC=0. SAFE-COSMETIC.