Align Agent mode to strict stepwise generation and execution, add deterministic and safety hardening, and sync deployment/module documentation for Phase 5A.5/5B/5C rollout.
- implement strict stepwise execution path and dependency short-circuiting
- persist step-level errors/results and stream step_* progress events
- add agent plan params patch route and schema/migration support
- improve R sanitizer/security checks and step result rendering in workspace
- update SSA module guide and deployment change checklist
Made-with: Cursor
