fix: restore ayanamsa state and keep tests hermetic

scripts/muhurta.py

@@ -18,7 +18,7 @@ from datetime import datetime, timedelta
 import calendar
 import math
 
-from ayanamsa_utils import sidereal_flags
+from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, sidereal_flags
 
 # ── Vara（周日行星）──────────────────────────────────────────────────
 VARA_LORDS = {
@@ -2138,7 +2138,7 @@ def _local_time_from_jd(jd: float, tz: float) -> str:
     return local_dt.strftime('%Y-%m-%d %H:%M')
 
 
-def _swisseph_sun_moon_lon(jd: float, ayanamsa_name: str = 'lahiri') -> Optional[Tuple[float, float]]:
+def _swisseph_sun_moon_lon(jd: float, ayanamsa_name: str = DEFAULT_AYANAMSA_NAME) -> Optional[Tuple[float, float]]:
     try:
         import swisseph as swe
         flags = sidereal_flags(swe, ayanamsa_name)
@@ -2192,7 +2192,7 @@ def calc_panchanga_end_times(
     day: int,
     tz: float,
     local_hours: float,
-    ayanamsa_name: str = 'raman',
+    ayanamsa_name: str = DEFAULT_AYANAMSA_NAME,
 ) -> Optional[Dict]:
     """Calculate current Tithi/Nakshatra/Yoga end times from SwissEph positions."""
     jd_start = _jd_for_local_time(year, month, day, local_hours, tz)
@@ -2903,7 +2903,7 @@ def panchanga_range_report(
     lat: Optional[float] = None,
     lon: Optional[float] = None,
     tz: Optional[float] = None,
-    ayanamsa_name: str = 'raman',
+    ayanamsa_name: str = DEFAULT_AYANAMSA_NAME,
 ) -> Dict:
     """Build a date-range Panchanga calendar with daytime inauspicious windows."""
     start_dt = datetime.strptime(start_date[:10], '%Y-%m-%d')
@@ -3034,7 +3034,7 @@ def muhurta_range_search(
     lon: Optional[float] = None,
     tz: Optional[float] = None,
     avoid_inauspicious_periods: bool = True,
-    ayanamsa_name: str = 'raman',
+    ayanamsa_name: str = DEFAULT_AYANAMSA_NAME,
 ) -> Dict:
     """Search a date range for ranked Muhurta candidates for a selected activity."""
     limit = max(1, min(int(limit or 5), 20))
@@ -3106,7 +3106,7 @@ def build_muhurta_sidecar(
     lat: Optional[float] = None,
     lon: Optional[float] = None,
     tz: Optional[float] = None,
-    ayanamsa_name: str = 'raman',
+    ayanamsa_name: str = DEFAULT_AYANAMSA_NAME,
 ) -> Dict:
     """Compact Muhurta/Panchanga packet for unified workflow consumers."""
     activity = activity if activity in ACTIVITY_RULES else 'business'