don't include commit in applywrites items

server/handle_repo_apply_writes.go

···
 		return helpers.ServerError(e, nil)
 	}
 
+	for i := range results {
+		results[i].Commit = nil
+	}
+
 	return e.JSON(200, ComAtprotoRepoApplyWritesResponse{
 		Commit:  *results[0].Commit,
 		Results: results,

server/repo.go

···
 }
 
 type ApplyWriteResult struct {
+	Type             string      `json:"$type,omitempty"`
 	Uri              string      `json:"uri"`
 	Cid              string      `json:"cid"`
-	Commit           *RepoCommit `json:"commit"`
+	Commit           *RepoCommit `json:"commit,omitempty"`
 	ValidationStatus *string     `json:"validationStatus"`
 }