fix(ephemeris): include nutation in the sidereal frame

恒星黄道改为与 Swiss Ephemeris FLG_SIDEREAL 同一套含章动岁差。
产品默认路径不再用平岁差去减含章动的视位置。上升和宫头用同一个岁差。
校正身份升到 rectification-v5-matrix-scoring-12。
BUG-1275。未推送，未部署。v5 先验头名三格下降 1.3 个百分点，不调参。

scripts/rectification/kp_cusp_observation.py

@@ -9,7 +9,7 @@ from __future__ import annotations
 
 from typing import Any
 
-from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, apply_ayanamsa, current_ayanamsa_name
+from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, apply_ayanamsa, current_ayanamsa_name, sidereal_ayanamsa_degrees
 from kp_system import KP_LORDS, get_kp_lords
 from scripts.domain_calculation_service import swiss_ephemeris_lock
 
@@ -59,7 +59,7 @@ def observe_kp_cusps(jd: float | None, lat: float | None, lon: float | None) ->
         try:
             apply_ayanamsa("krishnamurti", swe)
             cusps_raw, _ascmc = swe.houses(float(jd), float(lat), float(lon), b"P")
-            ayanamsa = float(swe.get_ayanamsa(float(jd)))
+            ayanamsa = sidereal_ayanamsa_degrees(float(jd), swe)
             houses: dict[str, dict[str, Any]] = {}
             indices: dict[str, int] = {}
             for house in range(1, 13):