fix: temporary fix, revert zod schema definitions for mcp tools to zod v3 (#1323)

mcp-server/src/tools/expand-task.js

@@ -3,7 +3,9 @@
  * Tool to expand a task into subtasks
  */
 
-import { z } from 'zod';
+// TEMPORARY: Using zod/v3 for Draft-07 JSON Schema compatibility with FastMCP's zod-to-json-schema
+// TODO: Revert to 'zod' when MCP spec issue is resolved (see PR #1323)
+import { z } from 'zod/v3';
 import {
 	handleApiResult,
 	createErrorResponse,