### Breaking Changes
- **Queue API replaced with steer/followUp**: The `queueMessage()` method has been split into two methods with different delivery semantics ([#403](https://github.com/badlogic/pi-mono/issues/403)):
- `steer(text)`: Interrupts the agent mid-run (Enter while streaming). Delivered after current tool execution.
- `followUp(text)`: Waits until the agent finishes (Alt+Enter while streaming). Delivered only when agent stops.
- **Settings renamed**: `queueMode` setting renamed to `steeringMode`. Added new `followUpMode` setting. Old settings.json files are migrated automatically.
- **AgentSession methods renamed**:
- `queueMessage()` → `steer()` and `followUp()`
- `queueMode` getter → `steeringMode` and `followUpMode` getters
- `setQueueMode()` → `setSteeringMode()` and `setFollowUpMode()`
- `queuedMessageCount` → `pendingMessageCount`
- `getQueuedMessages()` → `getSteeringMessages()` and `getFollowUpMessages()`
- `clearQueue()` now returns `{ steering: string[], followUp: string[] }`
- `hasQueuedMessages()` → `hasPendingMessages()`
- **Hook API signature changed**: `pi.sendMessage()` second parameter changed from `triggerTurn?: boolean` to `options?: { triggerTurn?, deliverAs? }`. Use `deliverAs: "followUp"` for follow-up delivery. Affects both hooks and internal `sendHookMessage()` method.
- **RPC API changes**:
- `queue_message` command → `steer` and `follow_up` commands
- `set_queue_mode` command → `set_steering_mode` and `set_follow_up_mode` commands
- `RpcSessionState.queueMode` → `steeringMode` and `followUpMode`
- **Settings UI**: "Queue mode" setting split into "Steering mode" and "Follow-up mode"
### Added
- Configurable double-escape action: choose whether double-escape with empty editor opens `/tree` (default) or `/branch`. Configure via `/settings` or `doubleEscapeAction` in settings.json ([#404](https://github.com/badlogic/pi-mono/issues/404))
- Vertex AI provider (`google-vertex`): access Gemini models via Google Cloud Vertex AI using Application Default Credentials ([#300](https://github.com/badlogic/pi-mono/pull/300) by [@default-anton](https://github.com/default-anton))
- Built-in provider overrides in `models.json`: override just `baseUrl` to route a built-in provider through a proxy while keeping all its models, or define `models` to fully replace the provider ([#406](https://github.com/badlogic/pi-mono/pull/406) by [@yevhen](https://github.com/yevhen))
- Automatic image resizing: images larger than 2000x2000 are resized for better model compatibility. Original dimensions are injected into the prompt. Controlled via `/settings` or `images.autoResize` in settings.json. ([#402](https://github.com/badlogic/pi-mono/pull/402) by [@mitsuhiko](https://github.com/mitsuhiko))
- Alt+Enter keybind to queue follow-up messages while agent is streaming
- `Theme` and `ThemeColor` types now exported for hooks using `ctx.ui.custom()`
- Terminal window title now displays "pi - dirname" to identify which project session you're in ([#407](https://github.com/badlogic/pi-mono/pull/407) by [@kaofelix](https://github.com/kaofelix))
### Changed
- Editor component now uses word wrapping instead of character-level wrapping for better readability ([#382](https://github.com/badlogic/pi-mono/pull/382) by [@nickseelert](https://github.com/nickseelert))
### Fixed
- `/model` selector now opens instantly instead of waiting for OAuth token refresh. Token refresh is deferred until a model is actually used.
- Shift+Space, Shift+Backspace, and Shift+Delete now work correctly in Kitty-protocol terminals (Kitty, WezTerm, etc.) instead of being silently ignored ([#411](https://github.com/badlogic/pi-mono/pull/411) by [@nathyong](https://github.com/nathyong))
- `AgentSession.prompt()` now throws if called while the agent is already streaming, preventing race conditions. Use `steer()` or `followUp()` to queue messages during streaming.
- Ctrl+C now works like Escape in selector components, so mashing Ctrl+C will eventually close the program ([#400](https://github.com/badlogic/pi-mono/pull/400) by [@mitsuhiko](https://github.com/mitsuhiko))