TrydingDay agent data discovery

Canonical public agent data URLs as JSON embedded in a minimal HTML page.

{
  "schema_version": "tryding-agent-discovery.v1",
  "contract_version": "tryding-agent-data.v1",
  "index_url": "https://trydingday.com/data/agents/v1/index.html",
  "archive_index_url": "https://trydingday.com/data/agents/v1/archive/index.html",
  "live_data_url": "https://trydingday.com/data/open-publications.html",
  "schema_url": "https://trydingday.com/data/agents/v1/schema.html"
}