## Core
### Bugfixes
- Kept HTTP event streams open after the initial connect event so subscribers continue receiving instance updates.
- Returned proper busy errors when a session is already running prompt or shell work.
- Let invalid `small_model` config values fall back cleanly instead of breaking small-model selection.
- Improved missing-model errors with suggestions across CLI and typed callers.
## TUI
### Improvements
- Restored markdown rendering for session output by default.
## SDK
### Improvements
- Added `instance.directory` and `instance.workspace` query support to the v2 model and provider calls.