Add actor contract fixture

Author: mdheller

examples/contracts/actor.agent-one.json

@@ -0,0 +1,15 @@
+{
+  "schema": "sourceos.actor-record/v1alpha1",
+  "actor_id": "actor:agent-one",
+  "actor_type": "agent",
+  "display_name": "Agent One",
+  "identity_id": "identity:agent-one",
+  "workspace_scope": ["workspace:default"],
+  "profile_scope": ["profile:local-dev"],
+  "capabilities": ["read", "write"],
+  "trust_level": "local",
+  "policy_subject": "sourceos.actor.agent-one",
+  "signing_key_ref": "key:agent-one-local",
+  "created_at": "2026-05-05T00:00:00Z",
+  "revoked_at": null
+}