Add DC-bias C_eff stima to derating and INFO when bulk C has no HF ceramic.

Keep both as labelled estimates: no Murata lot curve and no invented Z(f) target without f_sw.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_eval_report.py

@@ -85,8 +85,9 @@ def test_simple_project_eval_matches_committed_golden():
     assert scores.graph_ok, scores.graph_errors
     assert scores.precision == 1.0
     assert scores.recall == 1.0
-    assert scores.finding_count == 2
+    assert scores.finding_count == 3
     assert scores.by_status["WARNING"] == 2
+    assert scores.by_status["INFO"] == 1
 
 
 def test_simple_project_eval_rejects_truncated_graph(tmp_path: Path):