Add dynamic universe and subscription controls

crates/fidc-core/src/broker.rs

@@ -787,6 +787,30 @@ where
                 self.cancel_all_open_orders(date, reason, report);
                 Ok(())
             }
+            OrderIntent::UpdateUniverse { symbols, reason } => {
+                report.diagnostics.push(format!(
+                    "engine_control_intent_skipped kind=update_universe count={} reason={}",
+                    symbols.len(),
+                    reason
+                ));
+                Ok(())
+            }
+            OrderIntent::Subscribe { symbols, reason } => {
+                report.diagnostics.push(format!(
+                    "engine_control_intent_skipped kind=subscribe count={} reason={}",
+                    symbols.len(),
+                    reason
+                ));
+                Ok(())
+            }
+            OrderIntent::Unsubscribe { symbols, reason } => {
+                report.diagnostics.push(format!(
+                    "engine_control_intent_skipped kind=unsubscribe count={} reason={}",
+                    symbols.len(),
+                    reason
+                ));
+                Ok(())
+            }
         }
     }