Persist usage statistics which are currently only shown exactly once when CLI exits

[quijote]

Describe the feature or problem you'd like to solve

Copilot CLI does not provide usage statistics for individual users on an Enterprise plan.

Therefore, I asked Copilot CLI to generate a Python script to analyze its own data in ~/.copilot/ directory (see screenshot in context).

Unfortunately the following valuable information is currently only shown once to the user but not persisted in events.jsonl or other files:

 Total usage est:        7 Premium requests
 API time spent:         2m 59.626s
 Total session time:     12m 15.77s
 Total code changes:     +206 -77
 Breakdown by AI model:
  claude-sonnet-4.5       453.0k in, 13.1k out, 405.7k cached (Est. 7 Premium requests)

Proposed solution

When user exits Copilot CLI, please write information above into ~/.copilot/session-state/events.jsonl (e.g. as part of message with type abort) or another file. Please ensure that statistics cover the entire session (including continuations).

Example prompts or workflows

No response

Additional context

[github-actions]

This issue may have been opened accidentally. I'm going to close it now, but feel free to open a new issue with a more descriptive title.