hyperstack: split 3335-line monolith into lib/hyperstack/ modules

Extracts all classes from hyperstack.rb into focused library files:
- lib/hyperstack/config.rb    — ConfigLoader + Config (TOML loading, validation)
- lib/hyperstack/state.rb     — StateStore + PrefixedOutput (JSON state, threaded output)
- lib/hyperstack/client.rb    — HyperstackClient (REST API + retry logic)
- lib/hyperstack/wireguard.rb — LocalWireGuard (wg1.conf peer management, /etc/hosts)
- lib/hyperstack/provisioning.rb — ProvisioningScripts + RemoteProvisioner (SSH bootstrap)
- lib/hyperstack/manager.rb   — Manager (VM lifecycle orchestration)
- lib/hyperstack/watcher.rb   — VllmWatcher (Prometheus + GPU dashboard)
- lib/hyperstack/cli.rb       — CLI (OptionParser command dispatch)

hyperstack.rb becomes a 46-line entry point with require_relative calls.
All files pass `ruby -c` syntax check and `--help` runs correctly.

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

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