Windows PowerShell 5.1 returns every match from Get-Command. .Source on
that array joins the paths with a space, and the call operator then treats
the joined string as one program name. Git for Windows ships git.exe in
cmd\ and bin\, so setup died with CommandNotFoundException before pm
install ran.
setup-hermes.ps1 now installs the tool closure first (`pm install
--tools-only`), then prepares the ARM64 compiler environment, then syncs
the venv. The sync inherits that compiler environment. A bare `pm install`
and the update takeover path publish tools and put them on PATH before
uv sync. A missing tool stops the sync. A missing venv does not.
Verified: scripts/run_tests.sh on test_install_default_closure.py,
test_install_extra.py, and test_windows_build_deps.py — 13 passed.
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