Design JSONL format for conversation persistence

[bgervin]

PRD: Conversation Persistence Format (JSONL)

Objective

Standardize conversation history export, save, and reload using JSONL format. Document the schema for each line/object.

Tasks

• Define JSONL schema for conversation turn (user message, agent response, metadata, timestamp, etc.).
• Implement export to disk as JSONL.
• Implement reload from JSONL file.
• Document schema and provide sample files.
• Add tests for persistence and reload edge cases.

Acceptance Criteria

• Simulator can export/save and reload conversations in JSONL.
• Schema is documented and samples provided.
• Tests verify integrity and recovery.