fix(rectification): restore classic eight methods and observe KP Placidus cusps

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

scripts/domain_calculation_service.py

@@ -19,6 +19,13 @@ from sade_sati import calc_sade_sati_complete
 
 CONTRACT_VERSION = "1.0.0"
 _SWISSEPH_LOCK = threading.RLock()
+
+
+def swiss_ephemeris_lock() -> threading.RLock:
+    """Shared Swiss Ephemeris lock. Sidereal mode is process-global."""
+    return _SWISSEPH_LOCK
+
+
 _PLANET_IDS = {
     "Jupiter": swe.JUPITER,
     "Saturn": swe.SATURN,