flows create --step_configs doesn't apply handler configs

[chubes4]

Bug

wp datamachine flows create --step_configs accepts handler configuration JSON but doesn't persist the handler configs to the created flow steps. The steps are created with the correct step_type but handler_configs comes back as an empty array.

Reproduction

wp datamachine flows create \
  --pipeline_id=205 \
  --name="Bar Freda" \
  --step_configs='{"event_import":{"handler_slugs":["universal_web_scraper"],"handler_configs":{"universal_web_scraper":{"source_url":"https://www.barfreda.com/event","venue":34304,"venue_name":"Bar Freda"}}},"update":{"handler_configs":{"upsert_event":{"post_status":"publish","taxonomy_location_selection":"Queens"}}}}' \
  --scheduling=daily

Result: Flow created (ID 716) with 3 steps synced, but:

• event_import step has handler_configs: {"universal_web_scraper": []} — empty
• update step has handler key update instead of upsert_event, config applied to wrong key
• Warning output: Some step configurations failed: event_import: At least one of handler_slug, handler_config, user_message, add_handler, or remove_handler is required

Expected: Handler configs should be applied to the created flow steps in a single command.

Workaround

Three separate commands per step after creation:

1. flows add-handler to add the handler slug
2. flows update --step=<id> --handler-config='{...}' to apply the config
3. If default handler key is wrong, remove-handler the default and add-handler the correct one

Context

Discovered while setting up the Bar Freda flow in the new Queens pipeline. The Brooklyn pipeline flows (e.g. flow 407) have correct configs — unclear if those were created via admin UI or CLI.