feat(lotto): calibrate_winner_compute 당첨조합 역분석+percentile

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lotto/tests/test_backtest.py

@@ -68,6 +68,17 @@ def test_point_in_time_excludes_target_draw():
     assert len(pit) == 29
 
 
+def test_calibrate_winner_scores_and_percentile():
+    draws = _toy_draws(60)
+    winning6 = [3, 11, 19, 27, 35, 44]
+    res = bt.calibrate_winner_compute(draws, target_draw_no=60,
+                                      winning6=winning6, sample_m=500, seed=9)
+    assert set(res["scores"].keys()) >= {"score_total", "score_frequency",
+        "score_fingerprint", "score_gap", "score_cooccur", "score_diversity"}
+    assert 0.0 <= res["percentile"] <= 1.0
+    assert res["cache_draws"] == 59      # 1..59
+
+
 def test_generate_pool_partial_fill(monkeypatch):
     """weighted_sample_6이 항상 같은 조합만 반환하도록 패치 → cap에 먼저 걸려 len < n — 예외 없이 반환."""
     import random as _r