feat(agents): add publish and revert commands (6/8)

[VaibhavAcharya]

Summary

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

Part 6 of the agents CLI revamp split. Adds two commands that change what's live.

• agents:publish promotes a run's diff to production. Refuses on an out-of-sync run unless you pass --force, and points at agents:sync first.
• agents:revert resets the site back to a given session.

! This agent run is out of date: production has moved on since this run started.
  Sync first: netlify agents:sync 69fdd87e6c3eef71f1a7f5a2
  Or override: pass --force to publish the existing diff as-is
? How would you like to proceed?
  ▸ Sync with production now, then re-run publish manually (recommended)
    Publish anyway (use the current diff as-is)
    Cancel

Stacked on the sync/redeploy PR.

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[VaibhavAcharya]

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[VaibhavAcharya]

Link EX-2195