The PM-clean installers dropped the old "restart your terminal" /
"source ~/.bashrc" closing line, so a fresh install ended on "Run: hermes"
in a shell that could not find it.
install.ps1 now also prepends the bin dir to $env:Path. That variable is
process-wide, so under the documented `irm | iex` path (and `& .\install.ps1`)
the caller's own window resolves `hermes` immediately. When run as a script
file whose inherited PATH lacked the bin dir (e.g. `powershell -File`, a
child that cannot touch its parent), the ladder ends with one arrow line:
restart the terminal, or reload $env:Path from the User and Machine values.
Setup/gateway already launch hermes through the resolved runtime command.
install.sh prints the equivalent "open a new terminal, or run: source <rc>"
line after the ladder when the inherited PATH lacks ~/.local/bin; the
installer is always a child and cannot change its parent's PATH.
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