Add purpose and demand model extension

infospace/agent/briefs/concept-catalog-purpose-demand.md

@@ -0,0 +1,31 @@
+---
+id: agent-brief/concept-catalog-purpose-demand
+artifact_id: concept-catalog/purpose-demand
+source_path: concepts/purpose-demand.yaml
+source_kind: concept-catalog
+generated: true
+---
+
+<!-- GENERATED by info_tech_canon; do not edit by hand. -->
+
+# Agent Brief: Purpose And Consumer Demand Concept Catalog
+
+- Artifact ID: `concept-catalog/purpose-demand`
+- Kind: `concept-catalog`
+- Canonical path: `concepts/purpose-demand.yaml`
+- Full source: `concepts/purpose-demand.yaml`
+- Summary: Structured candidate concept catalog: Purpose And Consumer Demand Concept Catalog.
+
+## Retrieval Hints
+
+Imports and anchors:
+- `kernel/itc-core`
+- `model/governance`
+
+## Owned Concepts
+
+- `Purpose And Consumer Demand Concept Catalog`
+
+## Related Distinctions
+
+No common distinction is anchored directly on this artifact.