docs: define repository pattern boundary

templates/ARCHITECTURE.template.md

@@ -45,6 +45,14 @@ flowchart LR
 - {{DEPENDENCY_RULE_2}}
 - {{DEPENDENCY_RULE_3}}
 
+## Persistence Boundary
+
+- Pattern: Repository pattern
+- Repository interfaces: {{REPOSITORY_INTERFACE_LOCATION}}
+- Repository implementations: {{REPOSITORY_IMPLEMENTATION_LOCATION}}
+- Transaction boundary: {{TRANSACTION_BOUNDARY}}
+- Repository rules: {{REPOSITORY_RULES}}
+
 ## Request Flow
 
 {{REQUEST_FLOW}}

templates/CONVENTIONS.template.md

@@ -34,6 +34,10 @@
 
 ## Repository Rules
 
+- Use the repository pattern for persistence boundaries.
+- Repository interfaces live in {{REPOSITORY_INTERFACE_LOCATION}}.
+- Repository implementations live in {{REPOSITORY_IMPLEMENTATION_LOCATION}}.
+- Repositories should be domain-specific, not generic CRUD wrappers by default.
 - {{REPOSITORY_RULE}}
 
 ## Service Rules