fix(rectification): use candidate dates for cross-midnight dasha scoring

Add date-isolated caches and regression coverage, align scoring identity, and freeze full research reruns while preserving historical artifacts. Record unresolved cache/receipt identity and end-to-end acceptance gaps for branch review only.

Co-Authored-By: Claude Code <noreply@anthropic.com>

scripts/rectification/dasha_transition_proximity.py

@@ -8,7 +8,7 @@ bounded auxiliary signal, never larger than one day-level event body.
 from __future__ import annotations
 
 from collections.abc import Callable, Sequence
-from datetime import date
+from datetime import date, datetime
 from typing import Any
 
 from scripts.rectification.event_probes import _narayana_start_dates, _vim_start_dates
@@ -152,11 +152,15 @@ def merge_transition_proximity(
             moon = (context.get("planet_longitudes") or {}).get("Moon")
             if not isinstance(moon, (int, float)):
                 continue
-            vim_key = (birth_date, round(float(moon), 6), lo, hi)
+            # Native contexts retain the local date even when the window crosses midnight.
+            # Legacy time-only contexts still use the request's date.
+            candidate_at = context.get("candidate_at")
+            candidate_date = candidate_at.date().isoformat() if isinstance(candidate_at, datetime) else birth_date
+            vim_key = (candidate_date, round(float(moon), 6), lo, hi)
             if vim_key not in vim_cache:
-                vim_cache[vim_key] = _vim_start_dates(birth_date, float(moon), lo, hi)
+                vim_cache[vim_key] = _vim_start_dates(candidate_date, float(moon), lo, hi)
                 pd_cache[vim_key] = _vim_start_dates(
-                    birth_date,
+                    candidate_date,
                     float(moon),
                     lo,
                     hi,
@@ -165,7 +169,7 @@ def merge_transition_proximity(
             planets = context.get("planet_longitudes") or {}
             asc = context.get("ascendant_index")
             narayana_key = (
-                birth_date,
+                candidate_date,
                 int(asc) if isinstance(asc, int) else None,
                 lo,
                 hi,
@@ -173,7 +177,7 @@ def merge_transition_proximity(
             )
             if narayana_key not in narayana_cache:
                 narayana_cache[narayana_key] = (
-                    _narayana_start_dates(int(asc), planets, birth_date, lo, hi)
+                    _narayana_start_dates(int(asc), planets, candidate_date, lo, hi)
                     if isinstance(asc, int) and isinstance(planets, dict)
                     else None
                 )

scripts/rectification/scoring_service.py

@@ -13,7 +13,7 @@ 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-7"
+ALGORITHM_VERSION = "rectification-v5-matrix-scoring-8"
 INPUT_CONTRACT_VERSION = "rectification-calculation-spec-v4"
 PRECISION_WEIGHTS = {
     "day": 1.0,