Summary

Adds an accommodation marketplace profile for NIP-99 marketplace listings. The proposal keeps accommodation listings on the existing NIP-99 listing event kinds and defines the profile-specific fields clients need for lodging search, rendering, and filtering.

What this defines

• The accommodation marketplace profile tag.
• Accommodation-specific listing tags such as check-in/check-out times and spec details.
• H3-based g location indexing for area search without requiring exact property disclosure.
• Promoted compact tags for efficient relay/client filtering.
• Listing anchor and client behavior guidance for accommodation listings.

Scope

This does not define a new listing event kind. Generic marketplace behavior such as auto-acceptance, negotiability, deposits, dispute periods, and cancellation policy lives in the marketplace listing extension.