semi implemented and features implemented save checkpoint

docs/features/unchecked/router/valkey-messaging-transport-for-gateway.md

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+# Valkey (Redis-Compatible) Messaging Transport for Gateway
+
+## Module
+Router
+
+## Status
+IMPLEMENTED
+
+## Description
+Adds Valkey (Redis-compatible) as a messaging transport option for the Gateway/Router, including DI wiring, HELLO/heartbeat handling, atomic token store, cache factory, and messaging dispatch. Provides a high-performance alternative to the existing messaging infrastructure.
+
+## Implementation Details
+- **Modules**: `src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/`
+- **Key Classes**:
+  - `ValkeyTransportPlugin` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyTransportPlugin.cs`) - Valkey messaging transport plugin registration
+  - `ValkeyMessageQueue` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyMessageQueue.cs`) - Valkey-backed message queue with lease support
+  - `ValkeyMessageQueueFactory` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyMessageQueueFactory.cs`) - factory for creating Valkey message queues
+  - `ValkeyEventStream` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyEventStream.cs`) - Valkey-backed event stream for pub/sub
+  - `ValkeyAtomicTokenStore` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyAtomicTokenStore.cs`) - atomic token operations for idempotency
+  - `ValkeyCacheStore` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyCacheStore.cs`) - Valkey-backed distributed cache
+  - `ValkeyConnectionFactory` (`src/Router/__Libraries/StellaOps.Messaging.Transport.Valkey/ValkeyConnectionFactory.cs`) - manages Valkey connections
+- **Interfaces**: `IMessagingTransportPlugin`, `IMessageQueue`, `IEventStream`, `IAtomicTokenStore`, `IDistributedCache`
+- **Source**: SPRINT_8100_0011_0003_gateway_valkey_messaging_transport.md
+
+## E2E Test Plan
+- [ ] Register `ValkeyTransportPlugin` and verify messaging operations work through Valkey
+- [ ] Enqueue and dequeue messages via `ValkeyMessageQueue` and verify ordering
+- [ ] Publish and subscribe to events via `ValkeyEventStream` and verify delivery
+- [ ] Verify `ValkeyAtomicTokenStore` provides atomic compare-and-set operations
+- [ ] Verify `ValkeyCacheStore` stores and retrieves cached entries with TTL
+- [ ] Verify connection pooling via `ValkeyConnectionFactory` under concurrent load