Feature request: /archive command to close/archive current session

Feature Request

Add a /archive command (or similar) that programmatically archives/closes the current Claude Code conversation session.

Use Case

In project workflows, we use custom skills (slash commands) like /task-done that finalize work: run lint, tests, code review, commit, and update changelog. After all steps complete, the conversation is effectively done — there's no reason to keep it active.

Currently there's no way to archive/close the session from within a skill. We can only remind the user to do it manually.

Proposed Solution

A /archive or --archive-session command that:

1. Marks the current session as archived/completed
2. Optionally adds a summary/label for the archived session
3. Can be called programmatically from custom skills

This would enable fully automated task workflows where the session cleanly closes after task completion.

Workaround

Currently we add a manual reminder at the end of our /task-done skill asking the user to archive the chat themselves.