Federated agent and publisher discovery

[bokelley]

Summary

Implements federated agent and publisher discovery for the AdCP directory. The system now returns both directly registered agents/publishers and those discovered from publisher adagents.json files and sales agent responses.

Key Features

• Registered + Discovered Agents: Lists agents from member profiles plus agents discovered from publisher authorized_agents arrays
• Registered + Discovered Publishers: Lists publishers from member profiles plus publishers discovered from sales agent list_authorized_properties responses
• Reverse Lookups: Find agents authorized for a domain, domains an agent is authorized for, and sales agents claiming a domain
• API Endpoints: Five new federated endpoints plus MCP tools for discovery and lookups
• Database-backed: PostgreSQL cache with optimized indexes for fast queries

Implementation

• New database schema with discovered_agents, discovered_publishers, and agent_publisher_authorizations tables
• FederatedIndexService merges registered and discovered data with proper deduplication
• Crawler automatically crawls both registered publishers and sales agent discovered domains
• Support for both verified authorizations (from adagents.json) and unverified claims (from agent responses)

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