MetaHz runtime launcher for Windows

This starts an EXISTING current MetaClaw source checkout. It is not a standalone
installer and does not include Node, Python, MetaClaw, model weights or solvers.

1. Extract the ZIP. Keep Start-MetaHz.cmd and Start-MetaHz.ps1 together.
2. Double-click Start-MetaHz.cmd. It looks for your current MetaClaw source
   checkout, or asks for its folder. Its dependencies must already be installed.
3. Keep the runtime window open. Return to https://metahz.ai/dashboard/ and
   click Connect. Allow local-network access if your browser requests it.
4. MetaHz connects automatically without a pairing code. The launcher trusts
   only the two exact MetaHz sites; your local API keys stay on your computer.

The launcher delegates to sites/metahz/start-runtime.ps1 in your checkout.
That script allows the two exact MetaHz origins for this process and restores
the calling environment when the runtime exits. This launcher does not start
a native solve or download/update your source or dependencies.

To inspect compatibility without starting anything:
powershell -NoProfile -File .\Start-MetaHz.ps1 -Repository D:\GitHub\MetaClaw -CheckOnly

The CMD wrapper permits its PowerShell script for that process only. It does
not change the system execution policy. You can inspect both text files first.
