## ADDED Requirements

### Requirement: Modal interactions are tagged for analytics
The system SHALL emit Umami analytics events for summary modal open and close actions.

#### Scenario: Modal open event tagging
- **WHEN** a user opens the summary modal
- **THEN** the system emits a modal-open Umami event
- **AND** event payload includes article context identifier

#### Scenario: Modal close event tagging
- **WHEN** a user closes the summary modal
- **THEN** the system emits a modal-close Umami event
- **AND** event payload includes article context identifier when available

### Requirement: Source link-out interactions are tagged for analytics
The system SHALL emit Umami analytics events for source/citation link-outs from summary modal.

#### Scenario: Source link-out event tagging
- **WHEN** a user clicks source/citation link in summary modal
- **THEN** the system emits a link-out Umami event before or at navigation trigger
- **AND** event includes source URL or source identifier metadata
