Add mixed compare benchmark baseline

notes/mixed_compare_benchmark_baseline.md

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+# Mixed Compare Benchmark Baseline
+
+Date: 2026-02-16
+
+Benchmark:
+- MixedCompareBenchmarkTest.benchmarkMixedCompareOps
+
+Command:
+`BENCHMARKS=true timeout 20s ./gradlew :lynglib:jvmTest --tests MixedCompareBenchmarkTest --rerun-tasks`
+
+Result:
+- mixed-compare elapsed=374 ms