feat: add Ekadhipatya Shodhana

(cherry picked from commit 868f1dadb69e870fbf20223e4fcd0550286bc220)

scripts/ashtakavarga.py

@@ -620,3 +620,45 @@ def calc_trikona_shodhana(sav_scores: List[int]) -> Dict:
         'status': 'executed',
         'claim_boundary': 'Standalone classical reduction; Ekadhipatya Shodhana remains a separate layer.',
     }
+
+
+EKADHIPATYA_SIGN_PAIRS = ((0, 7), (1, 6), (2, 5), (8, 11), (9, 10))
+
+
+def calc_ekadhipatya_shodhana(
+    rows: Dict[str, List[int]], occupied_signs: set[int]
+) -> Dict:
+    """Apply PyJHora/PVR Ekadhipatya Shodhana to post-Trikona rows."""
+    reduced = {planet: list(values) for planet, values in rows.items()}
+    audit = []
+    for planet, values in reduced.items():
+        if len(values) != 12:
+            raise ValueError('each BAV row must contain exactly 12 signs')
+        for first, second in EKADHIPATYA_SIGN_PAIRS:
+            first_value, second_value = values[first], values[second]
+            if first_value == 0 or second_value == 0:
+                continue
+            first_occupied = first in occupied_signs
+            second_occupied = second in occupied_signs
+            before = [first_value, second_value]
+            if first_occupied and second_occupied:
+                continue
+            if first_occupied != second_occupied:
+                occupied, vacant = (first, second) if first_occupied else (second, first)
+                values[vacant] = values[occupied] if values[occupied] < values[vacant] else 0
+            elif first_value == second_value:
+                values[first] = values[second] = 0
+            elif first_value > second_value:
+                values[first] = second_value
+            else:
+                values[second] = first_value
+            audit.append({'planet': planet, 'pair': [first, second], 'before': before,
+                          'after': [values[first], values[second]]})
+    return {
+        'method': 'Ekadhipatya Shodhana',
+        'rows': reduced,
+        'occupied_signs': sorted(occupied_signs),
+        'audit': audit,
+        'status': 'executed',
+        'claim_boundary': 'Applied after Trikona Shodhana; source profile follows PyJHora/PVR rule ordering.',
+    }