Add reviewer, artifact store, and paginated queries

docs/backlog/01_execution_backlog.md

@@ -20,7 +20,7 @@
 
 - [x] graph scheduler service
 - [x] node runner abstraction
-- [ ] reviewer contract
+- [x] reviewer contract
 - [x] finalizer contract
 - [x] resume/cancel use cases
 - [x] idempotency policy
@@ -31,8 +31,8 @@
 - [x] SQLAlchemy models
 - [x] repositories for PostgreSQL/SQLite
 - [x] migrations
-- [ ] artifact metadata persistence
-- [ ] event store queries with pagination
+- [x] artifact metadata persistence
+- [x] event store queries with pagination
 
 ## Package D: Integrations
 
@@ -53,7 +53,7 @@
 
 ## Package F: Validation
 
-- [ ] contract tests
-- [ ] scenario tests
-- [ ] smoke suite
+- [x] contract tests
+- [x] scenario tests
+- [x] smoke suite
 - [ ] static checks in CI

docs/storage/01_schema.md

@@ -169,6 +169,17 @@ Migration skeleton:
 - `confirmations(status, created_at)`
 - `worker_sessions(status, last_heartbeat_at)`
 
+## Query Support
+
+Read-model adapters now support paginated queries for:
+
+- `task_events`
+- `model_invocations`
+- `tool_invocations`
+- `artifacts`
+
+This is implemented in both in-memory and SQLAlchemy adapters to keep test/runtime behavior aligned.
+
 ## Active Adapter Strategy
 
 - `memory` backend остается для быстрых unit/integration прогонов;