## ADDED Requirements

### Requirement: Editorial hero media declares its responsive spread width
Configured narrative hero media SHALL load eagerly with high priority and declare responsive sizes matching the rendered spread: full viewport width below the desktop breakpoint and seven twelfths of the viewport at desktop. Each configured hero image MUST retain meaningful alternative text; a missing image MUST use the tonal fallback without emitting media markup (SPEC §6.4, §6.6).

#### Scenario: A configured hero reports its responsive width
- **WHEN** a narrative route renders configured hero media
- **THEN** the image MUST declare `100vw` for smaller viewports and approximately `58vw` for the desktop spread
- **AND** it MUST use eager loading and high fetch priority

#### Scenario: An unconfigured hero emits no media
- **WHEN** a narrative route has no hero image path
- **THEN** the opening MUST not render an image element
- **AND** it MUST retain its readable tonal content