Include token_count events in non-interactive session files

What feature would you like to see?

Interactive sessions in Codex CLI don't emit token_count events to session JSONL files, making it impossible for third-party tools like @ccusage/codex to track token usage.

Current Behavior

When running Codex interactively (not via codex exec), the session files only contain:

• session_meta
• turn_context
• response_item
• event_msg with types like user_message, turn_aborted

Missing: event_msg with payload.type: "token_count"

Expected Behavior

Based on issue #5276, Codex should emit token_count events like:

{
  "timestamp": "...",
  "type": "event_msg",
  "payload": {
    "type": "token_count",
    "info": {
      "total_token_usage": { "input_tokens": ..., "output_tokens": ..., ... },
      "last_token_usage": { ... }
    }
  }
}

Environment

• Codex CLI: 0.88.0
• macOS Darwin 25.2.0
• Model: gpt-5.2-codex

Use Case

Third-party usage tracking tools (ccusage, etc.) rely on parsing session files to provide cost analysis without requiring API admin keys. Without token_count events, these tools report "No Codex usage data found."

Additional Information

I've verified this across multiple interactive sessions - none contain token_count events. The sessions were short but included both completed and aborted turns.