final cleanups

Author: kubukoz

modules/language-support/src/main/scala/playground/language/Feedback.scala

@@ -14,6 +14,7 @@ trait Feedback[F[_]] {
     msg: String
   ): F[Unit]
 
+  // custom smithyql/showOutputPanel notification in the client
   def showOutputPanel: F[Unit]
 
   def logOutput(

modules/lsp-kernel/src/main/scala/playground/lsp/LanguageServer.scala

@@ -91,6 +91,7 @@ trait LanguageServer[F[_]] {
     arguments: List[Json],
   ): F[Unit]
 
+  // custom smithyql/runQuery LSP request
   def runFile(
     params: RunFileParams
   ): F[Unit]

modules/lsp/src/main/scala/playground/lsp/PlaygroundLanguageClient.scala

@@ -4,6 +4,7 @@ import cats.effect.kernel.Async
 import cats.syntax.all.*
 import com.google.gson.JsonElement
 import org.eclipse.lsp4j
+import org.eclipse.lsp4j.jsonrpc.services.JsonNotification
 
 import java.util.concurrent.CompletableFuture
 import scala.jdk.CollectionConverters.*
@@ -65,3 +66,11 @@ object PlaygroundLanguageClientAdapter {
     }
 
 }
+
+trait PlaygroundLanguageClient extends lsp4j.services.LanguageClient {
+
+  @JsonNotification("smithyql/showOutputPanel")
+  def showOutputPanel(
+  ): Unit
+
+}