feat(agents): add follow-up command (8/8)

[VaibhavAcharya]

Summary

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

Part 8 (final) of the agents CLI revamp split. agents:follow-up sends a follow-up prompt to an existing run, carrying over the previous session's agent and model unless overridden.

✓ Follow-up session created!

Details:
  Task ID: 69fdc6c98c634538340f301f
  Session ID: 69fdc7b7f8743e44b30755ed
  Prompt: Also add tests
  Agent: Claude (sonnet)
  Status: RUNNING

With this merged, the stack reconstructs the full revamp. Stacked on the rename/archive PR.

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[VaibhavAcharya]

Link EX-2195