Sessions: list and resume (CLI + TUI)

[tmuskal]

👋 Hi team,

✨ Sessions – list and resume (CLI + TUI)

Fixes: #2080

Description

Adds first-class session management to codex-rs:

• Core: a sessions index that scans ~/.codex/sessions/**/rollout-*.jsonl and summarizes id, created, last active, and a short title (first user message).
• TUI CLI:
  • --list-sessions prints sessions with metadata and exits.
  • --resume <id|latest|path> resumes a saved session on startup.
• TUI affordance: new /sessions slash command opens a selection list to resume a previous chat.

Notes

• Persists using the existing rollout recorder; no migrations required.
• Backward compatible; default behaviors unchanged.

Tests

• cargo test -p codex-tui passes.
• Core suite shows 1 failing test (pre-existing; unrelated to this change) — suite::compact::summarize_context_three_requests_and_instructions.

[github-actions]

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[ctismer]

Hi @tmuskal , great, that's what I was looking for!
With this approach, I think we can go further and implement something like Claude Desktop's branching feature, where you can open a past message again and edit it as an alternative, building a tree of branches which all can be still reached.
I think the possibilities in the CLI would even be more.

[bhack]

Can we resume/reference a standard chatgpt session?