chore: add warning for genai-toolbox tool list update failure

Could not fetch tools from MCP server, added warning comment.

Co-authored-by: renovate[bot] <renovate[bot]@users.noreply.github.com>

Author: actions-user

registry/genai-toolbox/spec.yaml

@@ -4,6 +4,8 @@
 # Original source: https://github.com/stacklok/toolhive
 # Import timestamp: 2025-08-14T07:27:00Z
 # ---
+# WARNING: Tool list fetch failed on 2025-08-28
+# Manual verification may be required
 name: genai-toolbox
 description: A comprehensive MCP server for database operations that provides tools for connecting to and interacting with various database systems with advanced features like connection pooling, authentication, and observability. Mount and configured via tools.yaml
 tier: Official