- Singleton CosmosClient with env var config (COSMOS_ENDPOINT, COSMOS_KEY, COSMOS_DATABASE)
- Simple getContainer() for services
- Container registry with registerContainers(), getRegisteredContainer(), initializeAllContainers() for dashboards
- ContainerConfig type with partitionKeyPath and optional defaultTtl
- _resetClient() and _resetRegistry() for test isolation
- Peer dep: @azure/cosmos >=4.0.0
