feat(install): add Windows install.ps1

Bohdan Parkhomchukrequested to merge
bohdanp/orbit-install-ps1 into main

Adds a one-line PowerShell installer for the Orbit local CLI on Windows, matching the existing install.sh flow for macOS and Linux.

Install command

Windows users can install by running this in PowerShell:

irm https://gitlab.com/gitlab-org/orbit/knowledge-graph/-/raw/main/install.ps1 | iex

The installer downloads orbit-local-windows-x86_64.zip, verifies its SHA-256 checksum, unpacks it to %LOCALAPPDATA%\Programs\orbit\ (per-user, no admin needed), and adds that folder to the user PATH. After opening a new terminal, orbit is available as a command.

Notes

  • Available after the next tag release that includes the Windows artifact.
  • Tested on a fresh Windows Server 2022 VM: install, checksum verification, orbit.exe --help, and PATH update all work end-to-end.

Relates to #569 (closed)

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