Refactor tests for execution plan and add comprehensive storage tests

- Updated `TestModuleSingletons` in `test_execution_plan.py` to reflect new agent templates and playbook names.
- Changed assertions in playbook tests to match updated templates and agents.
- Introduced `test_storage.py` to cover the storage layer, including encryption, BlobStore, and VectorStore functionalities.
- Added tests for S3 interactions, ensuring upload, download, delete, and list operations work as expected.
- Implemented mock tests for Pinecone and Qdrant vector stores to validate upsert, search, and delete operations.

requirements.txt

@@ -17,3 +17,6 @@ httpx>=0.28.0
 websockets>=14.0
 pytest>=8.0.0
 pytest-asyncio>=0.24.0
+moto[s3]>=5.0.0
+pinecone>=5.0.0
+qdrant-client>=1.7.0