fix(httpapi): model optional worktree payload as no content (#29246)

packages/opencode/src/server/routes/instance/httpapi/groups/experimental.ts

@@ -5,7 +5,7 @@ import { Session } from "@/session/session"
 import { Worktree } from "@/worktree"
 import { NonNegativeInt } from "@opencode-ai/core/schema"
 import { Schema } from "effect"
-import { HttpApi, HttpApiEndpoint, HttpApiError, HttpApiGroup, OpenApi } from "effect/unstable/httpapi"
+import { HttpApi, HttpApiEndpoint, HttpApiError, HttpApiGroup, HttpApiSchema, OpenApi } from "effect/unstable/httpapi"
 import { Authorization } from "../middleware/authorization"
 import { InstanceContextMiddleware } from "../middleware/instance-context"
 import {
@@ -168,7 +168,7 @@ export const ExperimentalApi = HttpApi.make("experimental")
         HttpApiEndpoint.post("worktreeCreate", ExperimentalPaths.worktree, {
           disableCodecs: true,
           query: WorkspaceRoutingQuery,
-          payload: Schema.UndefinedOr(Worktree.CreateInput),
+          payload: [HttpApiSchema.NoContent, Worktree.CreateInput],
           success: described(Worktree.Info, "Worktree created"),
           error: WorktreeApiError,
         }).annotateMerge(