Mejoras de sesion: estabilizacion, IA, Nexus Yonke y marketplace B2B

- F0 blindaje: Redis/Celery, pg_hba sin trust LAN, secretos a env 600, backups, webhook auth, jobs muertos
- F1 caja: bugs POS, reembolsos al corte, apartados, CFDI, topes de descuento en cotizacion/apartado
- F2/F7 IA de catalogo: autocategorizacion, dedup de SKUs con embeddings, OCR de facturas, descripciones, claves SAT, limpieza de fitment
- F3 IA en el flujo: vision Yonke, preguntas MeLi, venta cruzada, anomalias, sinonimos, busqueda semantica (rerank/embeddings)
- F4/F8 escala y cartera: /metrics+Prometheus+Grafana, pool, score de credito, churn, metricas multi-tenant
- Nexus Yonke (M1-M6): modelo de datos 1-de-1, alta por donador, vitrina publica, MeLi usado, consignacion, garantia por dias, reportes, etiquetas
- Marketplace B2B entre yonkes (catalogo + pedidos cross-tenant)
- Seguridad: auth en /api/admin/* (35 endpoints), alertas por tenant
- Migraciones v4.27/v4.28; timers expire-demos y rollup-metrics

pos/services/supplier_engine.py

@@ -10,11 +10,14 @@ On receive, automatically:
 
 from decimal import Decimal, ROUND_HALF_UP
 from datetime import date
+import logging
 
 from services.inventory_engine import record_purchase
 from services.accounting_engine import record_purchase_entry
 from services.audit import log_action
 
+logger = logging.getLogger('pos')
+
 TWO = Decimal('0.01')
 
 
@@ -320,8 +323,9 @@ def receive_po(conn, po_id, received_items, supplier_invoice=None, notes=None):
                 'total': float(total_mxn),
                 'supplier_name': _get_supplier_name(conn, po_supplier_id),
             })
-        except Exception:
-            pass  # Accounting errors never block receiving
+        except Exception as acc_err:
+            # Accounting errors never block receiving, but must be logged
+            logger.error(f'Accounting entry for received PO #{po_id} failed: {acc_err}')
 
     log_action(conn, 'PO_RECEIVE', 'purchase_order', po_id,
                new_value={'received_qty': received_total, 'status': new_status})