fix(api): yoga list is not cut to ten; an evaluated empty list is not replaced by a preview (upstream e9beae6b)

TASK-upstream-sync4-20261002 T4. Regression tests follow in the same branch.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

scripts/jyotish_api_server.py

@@ -6299,12 +6299,11 @@ class JyotishAPIHandler(BaseHTTPRequestHandler, VedastroEvidenceMixin, SynastryM
         normalized['houses'] = chart.get('houses') or modules.get('house_map') or {}
         normalized['dasha'] = modules.get('dasha') or chart.get('dasha') or {}
         yoga_module = modules.get('yoga') if isinstance(modules.get('yoga'), dict) else {}
-        normalized['yogas'] = (
-            chart.get('yogas')
-            or yoga_module.get('yogas')
-            or yoga_module.get('detected_yogas')
-            or []
-        )
+        # Presence, not truthiness (upstream e9beae6b): an evaluated empty list
+        # must not resurrect an older chart preview; the full module comes first.
+        normalized['yogas'] = next((rows for rows in (
+            yoga_module.get('yogas'), yoga_module.get('detected_yogas'), chart.get('yogas')
+        ) if isinstance(rows, list)), [])
         normalized['ashtakavarga'] = modules.get('ashtakavarga') or chart.get('ashtakavarga') or {}
         normalized['shadbala'] = modules.get('shadbala') or chart.get('shadbala') or {}
         normalized['birth'] = chart.get('birth_info') or full_reading.get('birth_info') or {}
@@ -7133,7 +7132,7 @@ class JyotishAPIHandler(BaseHTTPRequestHandler, VedastroEvidenceMixin, SynastryM
             import logging
             logging.warning(f"[api_server] yoga expansion in _detect_yogas failed: {e}")
 
-        return yogas[:10]
+        return yogas
 
     def _compute_remedies(self, body):
         remedies_module = _load_local_module('remedies')