feat: add window execution to runtime

crates/crank-runtime/src/error.rs

@@ -1,7 +1,7 @@
 use crank_adapter_graphql::GraphqlAdapterError;
 use crank_adapter_grpc::GrpcAdapterError;
 use crank_adapter_rest::RestAdapterError;
-use crank_core::Protocol;
+use crank_core::{ExecutionMode, Protocol};
 use crank_mapping::MappingError;
 use crank_schema::SchemaError;
 use thiserror::Error;
@@ -20,6 +20,15 @@ pub enum RuntimeError {
     RestAdapter(#[from] RestAdapterError),
     #[error("protocol {protocol:?} is not supported by runtime")]
     UnsupportedProtocol { protocol: Protocol },
+    #[error("operation {operation_id} does not define streaming config")]
+    MissingStreamingConfig { operation_id: String },
+    #[error("operation {operation_id} does not support requested execution mode {mode:?}")]
+    UnsupportedExecutionMode {
+        operation_id: String,
+        mode: ExecutionMode,
+    },
     #[error("invalid prepared request: {details}")]
     InvalidPreparedRequest { details: String },
+    #[error("invalid streaming payload: {details}")]
+    InvalidStreamingPayload { details: String },
 }