new feature: Integration with kbdb Autonomous

templates/agent_template_backend_day_zero/.env.example

@@ -207,3 +207,25 @@ LONG_TERM_MEMORY_MAX_CONTEXT_ITEMS=20
 LONG_TERM_MEMORY_MIN_CONFIDENCE=0.70
 LONG_TERM_MEMORY_AUTO_EXTRACT=true
 LONG_TERM_MEMORY_INJECT_CONTEXT=true
+
+###############################################################################
+# RAG provider selection (mutually exclusive at runtime)
+###############################################################################
+# standard = RAG original do agent_framework_oci (default, backward compatible)
+# kbdb     = KBDB enterprise via PKG_KB_SERVING.SEARCH_KNOWLEDGE_BASE
+RAG_PROVIDER=standard
+
+# Somente usados quando RAG_PROVIDER=kbdb. Se vazios, credenciais caem para ADB_*.
+KBDB_DB_USER=
+KBDB_DB_PASSWORD=
+KBDB_DB_DSN=
+KBDB_DB_WALLET_LOCATION=
+KBDB_DB_WALLET_PASSWORD=
+KBDB_SEARCH_TYPE=hybrid
+KBDB_NODE_EXPANSION=true
+KBDB_NODE_MAX_RELATED=8
+KBDB_GRAPH_CROSS_REF=false
+KBDB_MAX_CROSS_REF_HOPS=1
+KBDB_DOCUMENT_TYPE=customer_safe
+KBDB_METADATA_JSON=
+KBDB_MIN_SCORE=