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/shadbala.py

@@ -32,7 +32,7 @@ _script_dir = os.path.dirname(os.path.abspath(__file__))
 if _script_dir not in sys.path:
     sys.path.insert(0, _script_dir)
 from varga import varga_map, SIGNS as VARGA_SIGNS, SIGN_LORDS as VARGA_SIGN_LORDS
-from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, apply_ayanamsa, normalize_ayanamsa_name
+from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, apply_ayanamsa, normalize_ayanamsa_name, sidereal_ayanamsa_degrees
 
 # ============================================================================
 # 常量
@@ -173,7 +173,7 @@ def build_shadbala_context(jd_ut: float, lat: float, lon: float, ayanamsa: str =
         "jd_ut": float(jd_ut), "jd_local": local_jd,
         "lat": float(lat), "lon": float(lon), "timezone": float(timezone),
         "year": int(year), "month": int(month), "day": int(day), "local_hour": float(local_hour),
-        "ayanamsa": key, "ayanamsa_degrees": float(swe.get_ayanamsa_ut(float(jd_ut))),
+        "ayanamsa": key, "ayanamsa_degrees": sidereal_ayanamsa_degrees(float(jd_ut), swe),
         "sunrise_hour": sunrise, "sunset_hour": sunset, "previous_sunset_hour": previous_sunset,
         "house_midpoints": [float(value) % 360 for value in cusps],
     }