Feature request: optional completion / needs-attention notifications for Codex IDE Extension

What variant of Codex are you using?

IDE Extension (version 26.422.71525)

What feature would you like to see?

Problem

When Codex finishes a response / agent turn, asks a follow-up question, or waits for user approval, the VS Code extension does not reliably notify the user through the editor or the operating system.

This is painful for long-running tasks: after switching to another window, I have to keep checking the Codex panel manually to know whether the turn is done or whether Codex needs input.

Desired behavior

Please add an opt-in notification setting for the IDE extension.

Suggested events:

• agent-turn-complete
• needs-user-input
• approval-requested
• cloud-task-complete

Suggested behavior:

• only notify when the editor / Codex panel is unfocused by default
• optionally allow always
• use VS Code notification APIs where possible
• optionally support sound
• optionally bridge to the existing external notify hook if feasible
• include a “Do not show again” / disable setting to avoid notification spam

Why this matters

Codex often performs multi-minute tasks. A lightweight notification would make background usage much more practical, especially in VS Code-compatible editors where the Codex panel may be hidden or out of focus.

Related issues: #3962, #17646, #13020.

Additional information

_No response_