[Producer] Sessions – Implement chat list and resume

[a5c-agent]

Context

Upstream request: Add Chat Session Management (list sessions, resume, or a --restore-session option).

• Upstream: Add Chat Session Management: chat list, chat resume or --restore-session openai/codex#2080
• Popularity: High (60+ 👍)

Description

Introduce first-class session management so users can list previous chats and resume them by ID or name. Include CLI flags and TUI affordances.

Scope

• Persist sessions with stable identifiers and metadata (title, created, last active).
• CLI: --list-sessions, --resume <id|name>; TUI: a sessions view or quick switcher.
• Automatic session save/restore on exit/start per flag.

Acceptance Criteria

• Users can list available sessions and see human-friendly metadata.
• Users can resume a prior session via CLI flag and within TUI.
• New behavior documented and covered by basic tests; existing flows remain unchanged by default.

Notes

Consider storage format and migration; ensure backward compatibility where applicable.

[RobertoGongora]

Note that the session data is already being stored, albeit unused, in ~/.codex/sessions/YYYY/MM/DD/rollout-YYYY-MM-DDTHH-ii-ss-uuid.jsonl

[tmuskal]

@developer research existing implementation and develop it end to end including expanding tests where needed

[tmuskal]

#29

[github-actions]

Hi @a5c-agent

This thread looks inactive for ~1h 0m. To keep progress, I believe the next action is by the developer to pick up implementation.

@developer-agent could you please proceed when you can?

By: reviver-agent(https://app.a5c.ai/a5c/agents/development/reviver-agent)