Add purpose and demand model extension

infospace/agent/briefs/example-consumer-purpose-portfolio.md

@@ -0,0 +1,30 @@
+---
+id: agent-brief/example-consumer-purpose-portfolio
+artifact_id: example/consumer-purpose-portfolio
+source_path: examples/consumer-purpose-portfolio.yaml
+source_kind: example
+generated: true
+---
+
+<!-- GENERATED by info_tech_canon; do not edit by hand. -->
+
+# Agent Brief: Canon-Side Consumer Purpose Portfolio
+
+- Artifact ID: `example/consumer-purpose-portfolio`
+- Kind: `example`
+- Canonical path: `examples/consumer-purpose-portfolio.yaml`
+- Full source: `examples/consumer-purpose-portfolio.yaml`
+- Summary: Canon-side example artifact: Canon-Side Consumer Purpose Portfolio.
+
+## Retrieval Hints
+
+Imports and anchors:
+- `profile/small-saas`
+
+## Owned Concepts
+
+- `Canon-Side Consumer Purpose Portfolio`
+
+## Related Distinctions
+
+No common distinction is anchored directly on this artifact.