Add benchmark detection script and related tests; refactor settings and update project scripts

tests/unit/test_detection_benchmark.py

@@ -0,0 +1,19 @@
+import pytest
+
+from arbitrade.detection.benchmark import run_incremental_detection_benchmark
+
+
+def test_incremental_detection_benchmark_returns_metrics() -> None:
+    result = run_incremental_detection_benchmark(iterations=500)
+
+    assert result.iterations == 500
+    assert result.total_ms > 0.0
+    assert result.avg_ms > 0.0
+    assert result.p50_ms > 0.0
+    assert result.p95_ms > 0.0
+    assert result.max_ms >= result.p95_ms
+
+
+def test_incremental_detection_benchmark_rejects_invalid_iterations() -> None:
+    with pytest.raises(ValueError, match="iterations"):
+        run_incremental_detection_benchmark(iterations=0)