Deliver shell completion query replies

internal/commandmeta/metadata.go

@@ -67,6 +67,13 @@ type CompletionHint struct {
 	Choices []CompletionChoice
 }
 
+// CompletionResult contains neutral suggestions and the entered value prefix.
+type CompletionResult struct {
+	Kind    CompletionKind
+	Choices []CompletionChoice
+	Prefix  string
+}
+
 var reportingFlags = [...]Flag{
 	{Name: "quiet", Usage: "suppress substantive output and optional messages; keep failures visible", Default: "false", Boolean: true},
 	{Name: "verbose", Usage: "show warning and informational messages", Default: "false", Boolean: true},