[P0.5] Hero media brief and asset handoff

### Goal
Produce hero visual assets, imagery, or media backgrounds highlighting Philippine real estate / land management aesthetics.

### Dependencies
[P0.2]

### Acceptance Criteria
- High-resolution media asset integrated into hero section with proper aspect ratio and performance optimization

### Run
`/hero-bg`

Start with the `/hero-bg` entry point and review dependency P0.2, then locate the hero section it targets. Confirm the required Philippine real-estate visual direction and integrate a high-resolution asset with the stated aspect ratio and performance optimization. Done means the hero media is visibly integrated and meets the acceptance criterion.

Written by the indexing model from the issue text.