fix: restore ayanamsa state and keep tests hermetic

scripts/prashna_context.py

@@ -9,6 +9,10 @@ try:
     from scripts.domain_calculation_service import CalculationError, compute_chart
 except ModuleNotFoundError:  # pragma: no cover - CLI execution path
     from domain_calculation_service import CalculationError, compute_chart
+try:
+    from scripts.ayanamsa_utils import DEFAULT_AYANAMSA_NAME, normalize_ayanamsa_name
+except ModuleNotFoundError:  # pragma: no cover - CLI execution path
+    from ayanamsa_utils import DEFAULT_AYANAMSA_NAME, normalize_ayanamsa_name
 try:
     from scripts.gulika import calculate_gulika
 except ModuleNotFoundError:  # pragma: no cover - CLI execution path
@@ -39,6 +43,10 @@ def _timezone_offset(value: Any, moment: datetime) -> float:
     raise PrashnaContextError("timezone must be a numeric UTC offset or present in question_timestamp")
 
 
+def _payload_ayanamsa(payload: dict[str, Any]) -> str:
+    return normalize_ayanamsa_name(payload.get("ayanamsa") or DEFAULT_AYANAMSA_NAME)
+
+
 def build_prashna_context(payload: dict[str, Any]) -> dict[str, Any]:
     required = ("question_text", "question_timestamp", "lat", "lon", "timezone")
     missing = [field for field in required if payload.get(field) in (None, "")]
@@ -56,18 +64,21 @@ def build_prashna_context(payload: dict[str, Any]) -> dict[str, Any]:
         if abs(timestamp_tz - tz) > 0.001:
             raise PrashnaContextError("timezone conflicts with question_timestamp offset")
         moment = moment.replace(tzinfo=None)
+    ayanamsa = _payload_ayanamsa(payload)
     try:
         chart = compute_chart({
             "year": moment.year, "month": moment.month, "day": moment.day,
             "hour": moment.hour, "minute": moment.minute, "second": moment.second,
             "lat": float(payload["lat"]), "lon": float(payload["lon"]), "tz": tz,
-            "ayanamsa": str(payload.get("ayanamsa") or "lahiri"),
+            "ayanamsa": ayanamsa,
             "node_mode": str(payload.get("node_mode") or "mean"),
         })
     except (CalculationError, ValueError, TypeError) as exc:
         raise PrashnaContextError(f"Swiss Prashna chart blocked: {exc}") from exc
     try:
-        gulika = calculate_gulika(moment, lat=float(payload["lat"]), lon=float(payload["lon"]), tz=tz)
+        gulika = calculate_gulika(
+            moment, lat=float(payload["lat"]), lon=float(payload["lon"]), tz=tz, ayanamsa=ayanamsa
+        )
     except Exception as exc:
         gulika = {
             "status": "blocked",
@@ -92,7 +103,7 @@ def build_prashna_context(payload: dict[str, Any]) -> dict[str, Any]:
         "question_text": str(payload["question_text"])[:500],
         "question_timestamp": str(payload["question_timestamp"]),
         "location": {"lat": float(payload["lat"]), "lon": float(payload["lon"]), "timezone": tz, "location_convention": "wgs84"},
-        "ayanamsa": str(payload.get("ayanamsa") or "lahiri"),
+        "ayanamsa": ayanamsa,
         "node_mode": str(payload.get("node_mode") or "mean"),
         "chart_source": "swiss_ephemeris_backend",
         "ascendant": chart["ascendant"],