Turns the consumer's resource into the outbound webhook Endpoint — the delivery target with its durable circuit-breaker state and its secret REFERENCES.

use Ash.Resource,
  data_layer: AshSqlite.DataLayer,
  extensions: [AshHooks.Endpoint]

The extension injects: url, status (:enabled | :disabled — the durable disable the 410 rule and operators flip; an in-process fuse would forget, this does not), and the four secret refs (secret_ref required, previous_secret_ref / legacy_secret_ref / legacy_previous_secret_ref for rotation and the legacy envelope). All four are AshHooks.Endpoint.SecretRef — the TYPE rejects secret-shaped literals (whsec_ / whsk_ / whpk_ prefixed material) at cast, on every write path including consumer-defined actions: secrets live behind consumer callbacks, rows carry only their references (ADR-0005).

The dispatcher skips :disabled endpoints entirely (no delivery row). The SSRF guard (scheme/private-range/link-local/metadata checks) runs at registration on every write path AND again at send time with DNS re-resolution — this resource is its registration substrate.