feat(logging, executor): add request logging tests and WebSocket-based Codex executor

- Introduced unit tests for request logging middleware to enhance coverage.
- Added WebSocket-based Codex executor to support Responses API upgrade.
- Updated middleware logic to selectively capture request bodies for memory efficiency.
- Enhanced Codex configuration handling with new WebSocket attributes.

sdk/cliproxy/executor/context.go

@@ -0,0 +1,23 @@
+package executor
+
+import "context"
+
+type downstreamWebsocketContextKey struct{}
+
+// WithDownstreamWebsocket marks the current request as coming from a downstream websocket connection.
+func WithDownstreamWebsocket(ctx context.Context) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return context.WithValue(ctx, downstreamWebsocketContextKey{}, true)
+}
+
+// DownstreamWebsocket reports whether the current request originates from a downstream websocket connection.
+func DownstreamWebsocket(ctx context.Context) bool {
+	if ctx == nil {
+		return false
+	}
+	raw := ctx.Value(downstreamWebsocketContextKey{})
+	enabled, ok := raw.(bool)
+	return ok && enabled
+}

sdk/cliproxy/executor/types.go

@@ -10,6 +10,17 @@ import (
 // RequestedModelMetadataKey stores the client-requested model name in Options.Metadata.
 const RequestedModelMetadataKey = "requested_model"
 
+const (
+	// PinnedAuthMetadataKey locks execution to a specific auth ID.
+	PinnedAuthMetadataKey = "pinned_auth_id"
+	// SelectedAuthMetadataKey stores the auth ID selected by the scheduler.
+	SelectedAuthMetadataKey = "selected_auth_id"
+	// SelectedAuthCallbackMetadataKey carries an optional callback invoked with the selected auth ID.
+	SelectedAuthCallbackMetadataKey = "selected_auth_callback"
+	// ExecutionSessionMetadataKey identifies a long-lived downstream execution session.
+	ExecutionSessionMetadataKey = "execution_session_id"
+)
+
 // Request encapsulates the translated payload that will be sent to a provider executor.
 type Request struct {
 	// Model is the upstream model identifier after translation.