Add brand and property registry lookup methods

[bokelley]

Summary

Add methods to the Python client for looking up brands and properties from the AdCP registry, including bulk operations for operational workflows.

New Methods

Brand Lookups

• lookup_brand(domain: str) — resolve a single domain to its canonical brand identity via GET /api/brands/resolve
• lookup_brands(domains: list[str]) — bulk resolve via POST /api/brands/resolve/bulk, returns dict[str, ResolvedBrand | None]

Property Lookups

• lookup_property(domain: str) — resolve a publisher domain to its property info via GET /api/properties/resolve
• lookup_properties(domains: list[str]) — bulk resolve via POST /api/properties/resolve/bulk, returns dict[str, PropertyInfo | None]

API Endpoints

The server-side bulk endpoints are implemented in adcontextprotocol/adcp#1035:

• POST /api/brands/resolve/bulk — accepts { "domains": [...] } (max 100), returns { "results": { domain: brand | null } }
• POST /api/properties/resolve/bulk — same pattern for properties

Use Case

Operational workflows need to resolve many domains efficiently — e.g., "I have 500 domains from a campaign report, which brands/properties do they map to?" The bulk methods avoid N+1 HTTP calls.

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