Separate S/R detector tests from primary R:R policy

scripts/run_backtest_snapshot.py

@@ -51,6 +51,8 @@ def _parse_args() -> argparse.Namespace:
         choices=(
             "production_control", "rr_aligned_control", "rewrite",
             "soft_zones", "confirmed_rounds", "gate_v2",
+            "rewrite_legacy_primary", "soft_zones_legacy_primary",
+            "confirmed_rounds_legacy_primary", "gate_v2_legacy_primary",
         ),
         default=None,
         help="Research-only S/R detector/gate arm.",

scripts/run_sr_v2_matrix.py

@@ -17,17 +17,12 @@ RUNNER = ROOT / "scripts" / "run_backtest_snapshot.py"
 COMPARE = ROOT / "scripts" / "compare_sr_variants.py"
 TRAINING_ARMS = (
     "production_control",
-    "rr_aligned_control",
-    "rewrite",
-    "soft_zones",
-    "confirmed_rounds",
-    "gate_v2",
-)
-# confirmed_rounds failed the post-2024 validation decisively and must not be
-# selected again merely because a corrected training curve looks attractive.
-LOCKABLE_ARMS = tuple(
-    arm for arm in TRAINING_ARMS[1:] if arm != "confirmed_rounds"
+    "rewrite_legacy_primary",
+    "soft_zones_legacy_primary",
+    "confirmed_rounds_legacy_primary",
+    "gate_v2_legacy_primary",
 )
+LOCKABLE_ARMS = TRAINING_ARMS[1:]
 
 
 def _add_common(parser: argparse.ArgumentParser) -> None: