CLI deploy command: add a progress indicator during deployment

[kriszyp]

The CLI deploy command runs silently for what can be a long time — npm install, package extraction, server restart — with no indication that anything is happening. A progress indicator (spinner, step log, or similar) would significantly improve the experience.

Ask

Show meaningful progress during harperdb deploy:

• "Downloading package…" / "Installing dependencies…" / "Restarting server…"
• Ideally a spinner or step-counter so the operator knows the process is live.

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🤖 Filed by Claude on behalf of Kris.

[kriszyp]

This is tightly coupled to #641 (Deployment tracking, replicated payload delivery, and rollback) to provide the updates to the CLI.

🤖 — Claude

[kriszyp]

Addressed by #657