Update Agents.md

Author: sdil

AGENTS.md

@@ -159,6 +159,7 @@ Execute these scenarios to verify workflow functionality:
 - **`/backend/`** - Storage backend implementations:
   - `mysql/` - MySQL backend
   - `redis/` - Redis backend
+  - `postgres/` - PostgreSQL backend
   - `sqlite/` - SQLite backend
   - `monoprocess/` - In-memory backend
 - **`/workflow/`** - Core workflow execution engine
@@ -337,4 +338,4 @@ When making code changes that affect the public API or add new features:
 - Test all code snippets to ensure they compile and run correctly
 - Update documentation whenever API changes are made
 - Include practical examples alongside theoretical explanations
-- Maintain consistency between inline code comments and external documentation
+- Maintain consistency between inline code comments and external documentation