fix(rectification): anchor candidate windows to civil dates across midnight

Carry explicit local date intervals instead of inferring the day from clock
order. Cluster width, delivery, adoption, and reports keep the actual civil
date; adopted date is stored separately from the reported birth_date.

Algorithm identity is scoring-9 / spec-v5. Scoring weights, confirmation
thresholds, and Skill version are unchanged. Isolated Linux final-3 gates
passed; four pre-existing Python failures remain. This is not a production
release.

scripts/rectification/scoring_service.py

@@ -13,8 +13,8 @@ from scripts.rectification.dasha_transition_proximity import merge_transition_pr
 from scripts.rectification.contracts import LifeEvent, RectificationRequest, is_scoreable_event
 from scripts.rectification.case_holdout import holdout_event_ids
 
-ALGORITHM_VERSION = "rectification-v5-matrix-scoring-8"
-INPUT_CONTRACT_VERSION = "rectification-calculation-spec-v4"
+ALGORITHM_VERSION = "rectification-v5-matrix-scoring-9"
+INPUT_CONTRACT_VERSION = "rectification-calculation-spec-v5"
 PRECISION_WEIGHTS = {
     "day": 1.0,
     "month": 0.8,
@@ -115,7 +115,7 @@ def _legacy_request(request: RectificationRequest, event: LifeEvent, sampled_dat
             "date": sampled_date, "precision": "day", "summary": event.get("summary", ""),
         }],
     }
-    for key in ("ayanamsa", "node_mode", "minute_step"):
+    for key in ("ayanamsa", "node_mode", "minute_step", "candidate_intervals"):
         if key in request:
             legacy_request[key] = request[key]
     return legacy_request
@@ -307,6 +307,7 @@ def build_event_contribution_matrix(
         "date_sensitivity": date_sensitivity,
         "missing_layers": sorted(missing_layers),
         "static_contexts": static_contexts,
+        **({"candidate_intervals": request["candidate_intervals"]} if "candidate_intervals" in request else {}),
     }
 
 
@@ -341,7 +342,7 @@ def calculation_spec(request: RectificationRequest) -> dict[str, Any]:
         return int(value) if value.is_integer() else value
 
     spec = {
-        "version": INPUT_CONTRACT_VERSION,
+        "version": INPUT_CONTRACT_VERSION if "candidate_intervals" in request else "rectification-calculation-spec-v4",
         "birthDate": request["birth_date"],
         "candidateRange": {"start": request["start_time"], "end": request["end_time"]},
         "latitude": json_number(request["lat"]),
@@ -359,6 +360,8 @@ def calculation_spec(request: RectificationRequest) -> dict[str, Any]:
     ):
         if source in request:
             spec[target] = request[source]  # type: ignore[literal-required]
+    if "candidate_intervals" in request:
+        spec["candidateIntervals"] = request["candidate_intervals"]
     return spec