Implement session persistence, replay, checkpointing, and resume #27
Description
Problem
Operators need durable session state so long-running and approval-gated work can survive restarts and be replayed later.
Scope
- Track transcript persistence, artifact persistence, replay, export, checkpointing, and resume flows
- Cover both normal session resume and approval-gated pause-resume behavior
Out of scope
- Provider-specific replay logic that bypasses the shared session model
- UI polish outside the required persistence and replay capabilities
Implementation notes
- Align the planned persistence model with Agent Framework session and workflow checkpoints
- Keep replay exportable and auditable
- Make the issue applicable to coding and non-coding sessions
Definition of Done
- The issue defines what must be persisted, replayed, checkpointed, and resumed
- The approval and restart scenarios are explicitly covered
Verification
- Review the issue against the feature spec session lifecycle and audit expectations
Dependencies
- Parent epic: [Epic] Add the embedded agent runtime host to the Uno desktop app #12
- Depends on: Integrate Microsoft Agent Framework as the orchestration runtime