Implement assertion suggestion engine, approval workflow, and outcome-oriented assertion persistence

[kalen-releasedgroup]

Summary

Promote meaningful assertions into the authoring workflow without bypassing human review.

Scope

• Infer candidate assertions from toasts, URL changes, heading changes, dialog closure, visible rows/cards, and relevant network success signals.
• Persist assertion candidates with confidence and evidence metadata.
• Implement approval/rejection workflows in the timeline/editor UI.

Requirement Links

• FR-INF-007, FR-AUTH-003
• Acceptance Criterion 7

Dependencies

• Normalized post-action signal pipeline
• Timeline workspace

Exit Criteria

• Suggested assertions are visible and reviewable.
• Only approved assertions are treated as committed scenario behaviour.
• Assertion history is traceable.