Complete POLYCODE-WP-0002 simulator v0.1 scaffold

tests/test_smoke.py

@@ -0,0 +1,14 @@
+from pathlib import Path
+
+from simulator import load_params, run_simulation, write_run
+
+
+def test_demo_run_produces_summary(tmp_path: Path) -> None:
+    params = load_params()
+    params["rounds"] = 3
+    summary = run_simulation(params)
+    assert summary.accepted + summary.rejected == 3
+    assert 0.0 <= summary.acceptance_rate <= 1.0
+    out = write_run(summary, params, tmp_path)
+    assert out.exists()
+    assert out.stat().st_size > 0