Why: The frontend contract mirror has to include script steps and critic fields before a workflow can be described to the client.
Evidence: make contracts copied modules/core/ts/types.ts. No screen or event changed.
Impact: contracts.ts only. The existing plan, inbox, and HITL cards stay the UI.
Refs: feature/agent-harness-p4
Co-authored-by: Cursor <cursoragent@cursor.com>