fix: restore ayanamsa state and keep tests hermetic

scripts/candidate_time_sensitivity_scan.py

@@ -11,6 +11,10 @@ from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Any
 
+try:
+    from scripts.ayanamsa_utils import DEFAULT_AYANAMSA_NAME
+except ModuleNotFoundError:  # pragma: no cover - direct script execution
+    from ayanamsa_utils import DEFAULT_AYANAMSA_NAME
 try:
     from scripts.rectification_input_contract import (
         candidate_input_fingerprint,
@@ -109,7 +113,7 @@ def scan_candidate_times(payload: dict[str, Any], *, uncertainty_minutes: int =
             "version": "rectification-input-v1",
             "center_input_fingerprint": candidate_input_fingerprint(payload),
             "settings": {
-                "ayanamsa": str(payload.get("ayanamsa") or "lahiri").strip().lower(),
+                "ayanamsa": str(payload.get("ayanamsa") or DEFAULT_AYANAMSA_NAME).strip().lower(),
                 "node_mode": str(
                     payload.get("node_mode", payload.get("nodeMode", "mean"))
                 ).strip().lower(),