Add vLLM watch dashboard, side-by-side layout, and insert-mode default

- hyperstack.rb: add VllmWatcher class and `watch` subcommand — live
  terminal dashboard polling all active VMs every 5 s via SSH; shows
  GPU util/VRAM/temp/power bars and vLLM throughput/requests/KV-cache/
  cache-hit bars aligned in a shared column layout
- draw(): render two or more VM panels side-by-side (horizontal) with a
  │ separator, padded to equal visible width; single VM falls back to
  vertical layout
- pi/agent/extensions/modal-editor: start in INSERT mode instead of NORMAL
- README: document watch command and update fish script rename

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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