fix(next): remove unused dataDir option from withWorkflow() (#1619)

The `dataDir` option was accepted in the type definition but never
read — `WORKFLOW_LOCAL_DATA_DIR` was unconditionally set to
`.next/workflow-data`. Remove the dead option to avoid confusion.

Author: johnlindquist

.changeset/remove-dead-datadir.md

@@ -0,0 +1,5 @@
+---
+"@workflow/next": patch
+---
+
+Remove unused `dataDir` option from `withWorkflow()` config. The option was accepted in the type but never read.

packages/next/src/index.ts

@@ -38,7 +38,6 @@ export function withWorkflow(
       lazyDiscovery?: boolean;
       local?: {
         port?: number;
-        dataDir?: string;
       };
     };
   } = {}