This change completes the transition of the interactive agent session (`useAgentStream`)
to a declarative-first tool rendering system.
Key changes:
- Reverted experimental `ToolDisplay` logic from legacy UI components (`DenseToolMessage`, etc.)
to establish a clean baseline.
- Introduced `HistoryItemToolDisplayGroup` and `ToolGroupDisplay` component in CLI.
- Added `display` property to `ToolCallRequestInfo` to carry declarative UI info natively.
- Populated tool request display information at the source (`Turn.ts` and `Scheduler.ts`)
using dynamic descriptions from tool invocations.
- Updated `useAgentStream` to emit the new history item type, providing a standalone
rendering path for interactive sessions.
- Ensured tool descriptions are updated when arguments are modified during confirmation.
This addresses PR feedback by:
- Creating a `renderDisplayDiff` utility to render `DisplayDiff` objects.
- Creating a `displayContentToString` utility to safely extract text from any `DisplayContent`.
- Updating non-interactive CLI to use `displayContentToString` to avoid data loss on non-text output.
- Updating `useAgentStream` to use `displayContentToString` to avoid stale UI state for non-text output.
- Shallow merging the `display` object in `useAgentStream` rather than replacing it, preventing loss of display metadata.
Michael Bleigh