feat(agents): add rename and archive commands (7/8)

[VaibhavAcharya]

Summary

Linear: https://linear.app/netlify/issue/EX-2195

Part 7 of the agents CLI revamp split. Adds two run-management commands.

• agents:rename sets a run's title. Sanitized and capped at 200 characters.
• agents:archive archives a run, with --yes to skip the confirmation prompt.

$ netlify agents:rename <id> "Anonymous feedback form"
✓ Agent run renamed.
  Title: Anonymous feedback form

$ netlify agents:rename <id> "$(printf 'a%.0s' {1..201})"
Error: Title must be 200 characters or fewer

Stacked on the publish/revert PR.

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[VaibhavAcharya]

Link EX-2195