fix(rectification): let a tied plateau be adopted as the session result

Adjacent minutes still cannot confirm a unique birth minute. A scored
representative time can now be accepted, and the copy must say the minute
is not unique.

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

scripts/rectification/decision_policy.py

@@ -167,13 +167,13 @@ def build_decision_receipt(
         missing_layers=sorted(built.get("missing_layers") or []),
     )
 
+    # Adoption is the session result when a representative time exists.
+    # Unique-top and diagnostic stability still block confirmation, not accept.
     acceptance_allowed = all((
         candidate_presence["passed"],
         event_quality["passed"],
         domain_diversity["passed"],
         date_quality["passed"],
-        unique_top["passed"],
-        diagnostic_quality["passed"],
     ))
     margin = _decimal(diagnostics.get("primary_secondary_margin_percent"))
     if acceptance_allowed and margin >= Decimal("20"):
@@ -189,12 +189,14 @@ def build_decision_receipt(
         (event_quality["passed"], "insufficient_events"),
         (domain_diversity["passed"], "insufficient_domain_diversity"),
         (date_quality["passed"], "low_date_quality"),
-        (unique_top["passed"], "tied_top_score"),
-        (diagnostic_quality["passed"], "insufficient_diagnostic_stability"),
     ):
         if not passed:
             acceptance_reasons.append(reason)
     confirmation_reasons = []
+    if not unique_top["passed"]:
+        confirmation_reasons.append("tied_top_score")
+    if not diagnostic_quality["passed"]:
+        confirmation_reasons.append("insufficient_diagnostic_stability")
     if not required_layers["passed"]:
         confirmation_reasons.append("missing_mandatory_layers")
     confirmation_reasons.extend(("engine_exact_confirmation_not_granted", "external_validation_not_passed"))