Feature request: Batch purge for archived threads (thread/purge)

What variant of Codex are you using?

Codex App + CLI

What feature would you like to see?

Please add a v2 API to permanently delete archived threads in batch, e.g. thread/purge.

• Params: threadIds: string[]
• Per-item result: purged | notFound | notArchived | inUse | failed

This is a clear complement to archive: archive is reversible, purge is final cleanup.

Additional information

I understand external PRs are invitation-only, so I’m opening this issue first.

I implemented a working prototype in my fork for reference:

• Branch: codex/thread-purge-api
• Commit: b20e9ae8c

If this aligns with your roadmap, I’m happy to submit an invited PR.