fix(chart): skip unused synastry overview and doomed report subprocesses

Synastry charts now skip the unused external overview and run together. Reports skip PyJHora subprocesses when that library is missing, and a full heavy-compute slot logs which paths hold it. Splitting quotas stays a simulation.

Gate, growth, and report pytest passed, as did the frontend route tests, tsc, lint, and the A/B script.

Co-Authored-By: Grok (agent loop)
Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/tajika.py

@@ -1501,7 +1501,28 @@ print(json.dumps({str(k): float(v) for k, v in dict(scores).items()}))
         return None
 
 
+_external_pyjhora_python_cached = False
+_external_pyjhora_python_value: Optional[str] = None
+
+
+def reset_external_pyjhora_python_cache() -> None:
+    """Tests and a fresh process both start with no remembered interpreter."""
+    global _external_pyjhora_python_cached, _external_pyjhora_python_value
+    _external_pyjhora_python_cached = False
+    _external_pyjhora_python_value = None
+
+
 def _resolve_external_pyjhora_python() -> Optional[str]:
+    """Remember the lookup, including "not installed", for this process."""
+    global _external_pyjhora_python_cached, _external_pyjhora_python_value
+    if _external_pyjhora_python_cached:
+        return _external_pyjhora_python_value
+    _external_pyjhora_python_value = _lookup_external_pyjhora_python()
+    _external_pyjhora_python_cached = True
+    return _external_pyjhora_python_value
+
+
+def _lookup_external_pyjhora_python() -> Optional[str]:
     candidates = [
         os.environ.get('JYOTISH_PYJHORA_PYTHON'),
         shutil.which('python3.14'),