Add purpose and demand model extension

infospace/agent/briefs/model-purpose-demand-extension.md

@@ -0,0 +1,41 @@
+---
+id: agent-brief/model-purpose-demand-extension
+artifact_id: model/purpose-demand-extension
+source_path: models/governance/InfoTechCanonPurposeDemandExtension.md
+source_kind: model-extension
+generated: true
+---
+
+<!-- GENERATED by info_tech_canon; do not edit by hand. -->
+
+# Agent Brief: InfoTechCanon Purpose And Demand Model Extension
+
+- Artifact ID: `model/purpose-demand-extension`
+- Kind: `model-extension`
+- Canonical path: `models/governance/InfoTechCanonPurposeDemandExtension.md`
+- Full source: `models/governance/InfoTechCanonPurposeDemandExtension.md`
+- Summary: Candidate extension to an existing canon model: InfoTechCanon Purpose And Demand Model Extension.
+
+## Retrieval Hints
+
+Imports and anchors:
+- `kernel/itc-core`
+- `model/information-space`
+- `model/task`
+
+## Owned Concepts
+
+- `ConsumerNeed`
+- `ConsumerPurpose`
+- `DemandSignal`
+- `EvolutionRequest`
+- `InfoTechCanon Purpose And Demand Model Extension`
+- `ProducerCapability`
+- `Purpose`
+- `PurposeFit`
+- `ScopePressure`
+- `UseCase`
+
+## Related Distinctions
+
+- **Intent vs Scope vs Purpose**: Intent captures why a producer or consumer exists, scope bounds producer ownership and promises, and purpose captures consumer demand anchored in consumer intent.