fix: restore ayanamsa state and keep tests hermetic

scripts/gulika.py

@@ -12,9 +12,9 @@ try:
 except ImportError:
     from scripts.saham_daynight import determine_daytime
 try:
-    from ayanamsa_utils import ayanamsa_display_name, normalize_ayanamsa_name, sidereal_flags
+    from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, ayanamsa_display_name, normalize_ayanamsa_name, temporary_ayanamsa
 except ImportError:
-    from scripts.ayanamsa_utils import ayanamsa_display_name, normalize_ayanamsa_name, sidereal_flags
+    from scripts.ayanamsa_utils import DEFAULT_AYANAMSA_NAME, ayanamsa_display_name, normalize_ayanamsa_name, temporary_ayanamsa
 
 
 # Monday=0, matching datetime.weekday(). Values are the end of Saturn's share
@@ -72,10 +72,10 @@ TEMPORAL_UPAGRAHAS = {
 }
 
 
-def _sidereal_ascendant(jd_ut: float, lat: float, lon: float, ayanamsa: str = "raman") -> float:
-    flags = sidereal_flags(swe, ayanamsa)
-    cusps, ascmc = swe.houses_ex(jd_ut, lat, lon, b"P", flags)
-    return float(ascmc[0]) % 360
+def _sidereal_ascendant(jd_ut: float, lat: float, lon: float, ayanamsa: str = DEFAULT_AYANAMSA_NAME) -> float:
+    with temporary_ayanamsa(ayanamsa, swe):
+        _, ascmc = swe.houses_ex(jd_ut, lat, lon, b"P", swe.FLG_SWIEPH | swe.FLG_SIDEREAL)
+        return float(ascmc[0]) % 360
 
 
 def calculate_gulika(
@@ -85,7 +85,7 @@ def calculate_gulika(
     lon: float,
     tz: float,
     method: str = "saturn_part_start",
-    ayanamsa: str = "raman",
+    ayanamsa: str = DEFAULT_AYANAMSA_NAME,
 ) -> dict[str, Any]:
     """Return Gulika from local moment/location using Swiss sunrise and sunset."""
     ayanamsa_name = normalize_ayanamsa_name(ayanamsa)
@@ -140,7 +140,7 @@ def _temporal_upagraha(
     tz: float,
     planet_index: int,
     segment_part: str,
-    ayanamsa: str = "raman",
+    ayanamsa: str = DEFAULT_AYANAMSA_NAME,
 ) -> dict[str, Any]:
     ayanamsa_name = normalize_ayanamsa_name(ayanamsa)
     daynight = determine_daytime(moment, lat=lat, lon=lon, tz=tz)
@@ -198,7 +198,7 @@ def calculate_upagrahas(
     lon: float,
     tz: float,
     sun_longitude: float,
-    ayanamsa: str = "raman",
+    ayanamsa: str = DEFAULT_AYANAMSA_NAME,
 ) -> dict[str, Any]:
     """Calculate the D1 Upagraha packet using local Swiss Ephemeris inputs."""
     ayanamsa_name = normalize_ayanamsa_name(ayanamsa)