- Added a new SessionManager.forkFrom test confirming terminal breadcrumb suppression while cloning source session history under a new parent session.
- Updated TanCommandController test fixtures with required assistant message API, provider, model, and completion metadata.
- Added `/tan` slash command registration and interactive handling.
- Added TanCommandController validation and async task scheduling for `/tan` dispatch.
- Added session cloning that suppresses breadcrumbs, copies artifacts, and handles abort cleanup.
- Added `promptCacheKey` support in Agent and inherited `providerPromptCacheKey` in session creation.