Add retrieval agent briefs and interface cards

README.md

@@ -64,3 +64,13 @@ The first executable profile proof is `small-saas`. It lives under
 `infospace/profiles/small-saas/` and includes connected example artifacts for a
 tenant-aware SaaS service: service, system, tenants, user, team, dataset,
 deployment, task, policy, control, evidence, and incident.
+
+## Agent Retrieval
+
+Agent-facing retrieval assets live under `infospace/agent/`:
+
+- `global-agent-brief.md`
+- `retrieval-index.md`, `retrieval-index.yaml`, and `retrieval-index.json`
+- per-artifact briefs in `agent/briefs/`
+- consumer brief templates in `agent/consumer-briefs/`
+- Canon Interface Card template in `agent/templates/`