WebFinger rel: agent-card

The URL https://mentionable.dev/ns/rel/agent-card is the WebFinger custom rel that binds a Mentionable address to its Agent Card document.

It appears verbatim in the JRD links[] array:

{
  "rel": "https://mentionable.dev/ns/rel/agent-card",
  "type": "application/json",
  "href": "https://example.com/.well-known/agent-card/scheduler"
}

Resolvers fetch the WebFinger JRD, find the link with this rel, and dereference href to obtain the Agent Card.

Deprecated alias. During the transition window (see issue #503) the legacy rel URI https://mentionable.dev/agent-card is recognised on inbound only by conformant Mentionable implementations. Publishers MUST emit the canonical /ns/rel/agent-card rel.

Spec: WebFinger §4 and docs/spec/webfinger.md .