fix(rectification): ask reverse-inference probes at engine dasha months

Keep Vimshottari/Narayana start dates instead of truncating to year, so
same-year month splits can appear on the choice card.

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

scripts/rectification/candidate_contrast.py

@@ -202,6 +202,7 @@ def candidate_split_hash(
     domain: str,
     year: int,
     groups: Sequence[Sequence[str]],
+    month: int | None = None,
 ) -> str:
     version = candidate_set_version_value or candidate_set_version(groups)
     grouped = "|".join(
@@ -209,7 +210,8 @@ def candidate_split_hash(
         for group in groups
         if group
     )
-    payload = f"{version}:{domain}:{year}:{grouped}"
+    window = f"{year}-{int(month):02d}" if isinstance(month, int) and 1 <= month <= 12 else str(year)
+    payload = f"{version}:{domain}:{window}:{grouped}"
     return hashlib.sha256(payload.encode("utf-8")).hexdigest()[:24]