- Implemented `emitFileArtifactEvent` for emitting file artifact events.
- Created `TerminalCapabilityTools` for executing terminal commands with workspace boundary checks and risk classification.
- Added `checkWorkspaceBoundary` and `classifyCommandRisk` functions for command validation.
- Introduced `terminalPolicy` for managing terminal command policies.
- Enhanced `ChatPage` to display file artifacts and provide options to open or reveal paths.
- Updated shared types to include artifact-related types and events.
- Added utility functions for grouping artifact events by task.
