fix(rectification): keep hour-window tail clusters and lock the search window (BUG-623, BUG-624, BUG-625)

Hour windows no longer drop later signature clusters. Credible range uses cluster coverage, and a mid-session spoken birth window gets a fixed reply without calling the model.

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

scripts/rectification/decision_policy.py

@@ -402,16 +402,40 @@ def build_candidate_decisions(
             abs(score - other) <= TIE_ABSOLUTE_TOLERANCE
             for other in all_scores
         )
+        cluster_times, cluster_start, cluster_end = _cluster_span(row)
         decisions.append({
             "candidate_id": str(uuid5(NAMESPACE_URL, f"{POLICY_VERSION}:{result_id}:{row['time']}")),
             "rank": index + 1,
             "time": row["time"],
             "relative_support": supports[index],
             "tied_minute_count": tied_minute_count,
+            "cluster_times": cluster_times,
+            "cluster_start": cluster_start,
+            "cluster_end": cluster_end,
         })
     return decisions
 
 
+def _cluster_span(row: dict[str, Any]) -> tuple[list[str], str, str]:
+    raw = row.get("cluster_times")
+    times: list[str] = []
+    seen: set[str] = set()
+    values = raw if isinstance(raw, list) and raw else [row.get("time")]
+    for item in values:
+        text = str(item or "")[:5]
+        if len(text) != 5 or text[2] != ":" or text in seen:
+            continue
+        seen.add(text)
+        times.append(text)
+    if not times:
+        clock = str(row.get("time") or "")[:5]
+        times = [clock] if len(clock) == 5 and clock[2] == ":" else []
+    times.sort(key=lambda value: int(value[:2]) * 60 + int(value[3:5]))
+    start = times[0] if times else str(row.get("time") or "")[:5]
+    end = times[-1] if times else start
+    return times, start, end
+
+
 def _gate(passed: bool, **details: Any) -> dict[str, Any]:
     return {"passed": passed, **details}