Add purpose and demand model extension

infospace/agent/briefs/pattern-intent-scope-purposes.md

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+---
+id: agent-brief/pattern-intent-scope-purposes
+artifact_id: pattern/intent-scope-purposes
+source_path: patterns/intent-scope-purposes.md
+source_kind: pattern
+generated: true
+---
+
+<!-- GENERATED by info_tech_canon; do not edit by hand. -->
+
+# Agent Brief: Intent Scope Purposes Pattern
+
+- Artifact ID: `pattern/intent-scope-purposes`
+- Kind: `pattern`
+- Canonical path: `patterns/intent-scope-purposes.md`
+- Full source: `patterns/intent-scope-purposes.md`
+- Summary: Reusable canon pattern: Intent Scope Purposes Pattern.
+
+## Retrieval Hints
+
+Imports and anchors:
+- `model/governance`
+- `model/task`
+
+## Owned Concepts
+
+- `Intent Scope Purposes Pattern`
+- `IntentScopePurposePattern`
+
+## 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.