- Add toolArguments to normalizeRunTimelineEvent output so persisted
sessions retain tool argument data across app restarts
- Add toolArguments field to AgentActivityState and propagate it in
applySessionEventActivity for real-time activity labels
- Add tests for normalization round-trip with and without toolArguments
- Add test for activity state including toolArguments
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>