[FEATURE] timestamping of user messages in exports

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Timestamping of user messages in exports, to make it easier to review them chronologically.

Proposed Solution

ISO date & Time in front of user request

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_