fixed the return values to strings instead of JSON.parse

.opencode/tools/tea-milestone.ts

@@ -9,7 +9,7 @@ export const milestoneList = tool({
   async execute(args, context) {
     try {
       const result = await $`tea milestone list --output json --state ${args.state}`.text()
-      return JSON.parse(result)
+      return result
     } catch (error: any) {
       return {
         error: "Failed to list milestones",
@@ -40,7 +40,7 @@ export const milestoneCreate = tool({
       }
       
       const result = await cmd.text()
-      return JSON.parse(result)
+      return result
     } catch (error: any) {
       return {
         error: "Failed to create milestone",