feat: add in-process adapter research contract

internal/tools/send_message_broute_adapter.go

@@ -52,6 +52,26 @@ func (c bRouteSendMessageConnector) ExecuteSendMessage(_ context.Context, reques
 			ErrorMessage:  "B-route adapter dry_run_contract mode validates request shape only and does not start a sidecar",
 			ConnectorMode: "broute-dry-run-contract",
 		}, nil
+	case "in_process_contract":
+		if err := validateBRouteSendMessageRequest(request); err != nil {
+			return SendMessageConnectorResult{
+				Accepted:      false,
+				Status:        "failed",
+				ErrorCode:     "broute_invalid_request",
+				ErrorMessage:  err.Error(),
+				ConnectorMode: "broute-in-process-contract",
+				SideEffects:   sendMessageNoSideEffects(),
+			}, nil
+		}
+		return SendMessageConnectorResult{
+			Accepted:          false,
+			Status:            "blocked",
+			ErrorCode:         "broute_in_process_contract_only",
+			ErrorMessage:      "B-route in_process_contract mode validates the future in-process adapter contract only; logged-in runtime reachability and sent-record evidence are still required",
+			ConnectorMode:     "broute-in-process-contract",
+			ProductionEnabled: false,
+			SideEffects:       sendMessageNoSideEffects(),
+		}, nil
 	default:
 		result := SendMessageConnectorResult{
 			Accepted:      false,