Upgrade Guide: Capability-Aware Storefront

The public tenant front door now resolves tenant identity, branding, locations, catalogue and capability/vertical authority rather than assuming every tenant is the same business type.

Client guidance

1. Resolve storefront by tenant slug.
2. Read capability/vertical metadata.
3. Render only supported transaction journeys.
4. Keep public-safe branding tenant-specific.
5. Fail closed if authority cannot be resolved.