cn_validate_truth: sensitivity by carrier frequency (rare < 5 % is the primary metric, K-027)

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01814GKVzZVL3FuF3DeiZXhv

scripts/v2/cn_tune_report.py

@@ -55,6 +55,8 @@ def main() -> int:
     val = json.loads((run / "val" / "summary.json").read_text())
     for t, bins in val["sensitivity"].items():
         print(f"  sensitivity {t}: " + ", ".join(f"{b} {x['found']}/{x['truth']}" for b, x in sorted(bins.items())))
+    for t, bins in val.get("sensitivity_by_carrier_frequency", {}).items():
+        print(f"  by frequency {t}: " + ", ".join(f"{b} {x['found']}/{x['truth']}" for b, x in sorted(bins.items())))
     return 0